单项选择题

正反转控制线路中，为了避免正向接触器和反向接触器同时得电，线路中采取了（）。 A. 位置控制 B. 自锁控制 C. 联锁控制 D. 点动控制

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单项选择题

According to the passage, privacy is like health in that_______.
A、people will make every effort to keep it
B、 its importance is rarely understood
C、it is something that can easily be lost
D、people don't cherish it until they lose it

图片中手势动作的意思是

答案：介绍