假设一个磁盘有200个磁道，编号从0～199。当前磁头正在143道上服务，并且刚刚完成了125道的请求。如果寻道请求队列的顺序是86，147，91，177，94，150，102，175，130

For anyone who hates doing yard work，your new best friend may have arrived.A robot can autonomously shovel snow，collect leaves and cut grass.
“We’re trying to help people not spend time on yard work，”said Steven Waelbers，the designer of the robot.“We want people to enjoy their free time with their family.”
The electric robot can run by itself in right directions with the help of two beacons （信号塔）that must be placed in the yard.The robot includes a camera and ultrasound sensor （超声传感器）that Waelbers said would stop quickly when it finds pets and people.
Owners of the robot will need to regulate the values stored in the robot.Then it will confirm the task it’s going to take.Before the robot operates by itself，an owner must manually wheel it around the yard –taking it around any obstacles like trees，bushes or mailboxes.By doing this，the robot is taught how long and wide the lawn is，and won’t accidentally destroy your rose bush or run to the neighborhood.
Once this setup is complete，and the $3，999robot has been trained on where to cut grass，rake leaves and shovel snow，it operates without any supervision.
Waelbers has always loved to build robots and play with electronics.He started work on a high-tech company after his father asked him to make a robot that would shovel snow for him.Waelbers plans to start sales in early 2017.

For anyone who hates doing yard work，your new best friend may have arrived.A robot can autonomously shovel snow，collect leaves and cut grass.
“We’re trying to help people not spend time on yard work，”said Steven Waelbers，the designer of the robot.“We want people to enjoy their free time with their family.”
The electric robot can run by itself in right directions with the help of two beacons （信号塔）that must be placed in the yard.The robot includes a camera and ultrasound sensor （超声传感器）that Waelbers said would stop quickly when it finds pets and people.
Owners of the robot will need to regulate the values stored in the robot.Then it will confirm the task it’s going to take.Before the robot operates by itself，an owner must manually wheel it around the yard –taking it around any obstacles like trees，bushes or mailboxes.By doing this，the robot is taught how long and wide the lawn is，and won’t accidentally destroy your rose bush or run to the neighborhood.
Once this setup is complete，and the $3，999robot has been trained on where to cut grass，rake leaves and shovel snow，it operates without any supervision.
Waelbers has always loved to build robots and play with electronics.He started work on a high-tech company after his father asked him to make a robot that would shovel snow for him.Waelbers plans to start sales in early 2017.

For anyone who hates doing yard work，your new best friend may have arrived.A robot can autonomously shovel snow，collect leaves and cut grass.
“We’re trying to help people not spend time on yard work，”said Steven Waelbers，the designer of the robot.“We want people to enjoy their free time with their family.”
The electric robot can run by itself in right directions with the help of two beacons （信号塔）that must be placed in the yard.The robot includes a camera and ultrasound sensor （超声传感器）that Waelbers said would stop quickly when it finds pets and people.
Owners of the robot will need to regulate the values stored in the robot.Then it will confirm the task it’s going to take.Before the robot operates by itself，an owner must manually wheel it around the yard –taking it around any obstacles like trees，bushes or mailboxes.By doing this，the robot is taught how long and wide the lawn is，and won’t accidentally destroy your rose bush or run to the neighborhood.
Once this setup is complete，and the $3，999robot has been trained on where to cut grass，rake leaves and shovel snow，it operates without any supervision.
Waelbers has always loved to build robots and play with electronics.He started work on a high-tech company after his father asked him to make a robot that would shovel snow for him.Waelbers plans to start sales in early 2017.

For anyone who hates doing yard work，your new best friend may have arrived.A robot can autonomously shovel snow，collect leaves and cut grass.
“We’re trying to help people not spend time on yard work，”said Steven Waelbers，the designer of the robot.“We want people to enjoy their free time with their family.”
The electric robot can run by itself in right directions with the help of two beacons （信号塔）that must be placed in the yard.The robot includes a camera and ultrasound sensor （超声传感器）that Waelbers said would stop quickly when it finds pets and people.
Owners of the robot will need to regulate the values stored in the robot.Then it will confirm the task it’s going to take.Before the robot operates by itself，an owner must manually wheel it around the yard –taking it around any obstacles like trees，bushes or mailboxes.By doing this，the robot is taught how long and wide the lawn is，and won’t accidentally destroy your rose bush or run to the neighborhood.
Once this setup is complete，and the $3，999robot has been trained on where to cut grass，rake leaves and shovel snow，it operates without any supervision.
Waelbers has always loved to build robots and play with electronics.He started work on a high-tech company after his father asked him to make a robot that would shovel snow for him.Waelbers plans to start sales in early 2017.

患者，65岁。以呼吸困难、发绀、恐惧、烦躁不安而急诊人院，诊断为：心脏病合并心力衰竭。

There was once an ant that was very thirsty.It ran here and there looking for some water but could not find any.Then suddenly，when the ant was almost ready to die of thirst，a large drop of water fell on it.The ant drank the water，which saved its life.The water was actually a tear from a young girl who was crying.Because of her sadness，the tear had magical qualities and suddenly the ant could speak the language of human beings.The ant looked up and saw the young girl sitting in front of a huge pile of seeds.“Why are you sad？”asked the ant.
“I′m the prisoner of the giant，”the girl told the ant.“He won′t let me go until I′ve made three separate heaps of grain，barley（大麦）and rye（黑麦）out of this huge pile of seeds in which they are all mixed together.”
“That will take you a month!”the ant said，looking at the huge pile of seeds.
“I know，”the girl cried，“and if I haven’t finished by tomorrow，the giant will eat me for his supper!”
“Don′t cry，”the ant said，“my friends and I will help you.”
Soon thousands of ants were at work，separating the three kinds of seeds.
The next morning，when the giant saw that the work had been done，he let the girl go.
Thus it was one of her tears that saved her life.

There was once an ant that was very thirsty.It ran here and there looking for some water but could not find any.Then suddenly，when the ant was almost ready to die of thirst，a large drop of water fell on it.The ant drank the water，which saved its life.The water was actually a tear from a young girl who was crying.Because of her sadness，the tear had magical qualities and suddenly the ant could speak the language of human beings.The ant looked up and saw the young girl sitting in front of a huge pile of seeds.“Why are you sad？”asked the ant.
“I′m the prisoner of the giant，”the girl told the ant.“He won′t let me go until I′ve made three separate heaps of grain，barley（大麦）and rye（黑麦）out of this huge pile of seeds in which they are all mixed together.”
“That will take you a month!”the ant said，looking at the huge pile of seeds.
“I know，”the girl cried，“and if I haven’t finished by tomorrow，the giant will eat me for his supper!”
“Don′t cry，”the ant said，“my friends and I will help you.”
Soon thousands of ants were at work，separating the three kinds of seeds.
The next morning，when the giant saw that the work had been done，he let the girl go.
Thus it was one of her tears that saved her life.

There was once an ant that was very thirsty.It ran here and there looking for some water but could not find any.Then suddenly，when the ant was almost ready to die of thirst，a large drop of water fell on it.The ant drank the water，which saved its life.The water was actually a tear from a young girl who was crying.Because of her sadness，the tear had magical qualities and suddenly the ant could speak the language of human beings.The ant looked up and saw the young girl sitting in front of a huge pile of seeds.“Why are you sad？”asked the ant.
“I′m the prisoner of the giant，”the girl told the ant.“He won′t let me go until I′ve made three separate heaps of grain，barley（大麦）and rye（黑麦）out of this huge pile of seeds in which they are all mixed together.”
“That will take you a month!”the ant said，looking at the huge pile of seeds.
“I know，”the girl cried，“and if I haven’t finished by tomorrow，the giant will eat me for his supper!”
“Don′t cry，”the ant said，“my friends and I will help you.”
Soon thousands of ants were at work，separating the three kinds of seeds.
The next morning，when the giant saw that the work had been done，he let the girl go.
Thus it was one of her tears that saved her life.