单项选择题As you approach Old River Control Structure Light you see a flashing amber light. You should().

A.navigate as close to the left descending bank as safety permits
B.navigate as close to the right descending bank as safety permits
C.turn into the inflow channel as the bypass is now open
D.slow your engine speed to not more than 5 mph


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1.单项选择题As you approach mile 659.4 AHP,you see on the right descending bank a flashing green light. This light marks().

A.a lock that is open
B.a sunken barge
C.a dolphin,water intake and discharge
D.the end of a wharf

2.单项选择题As you approach mile 427.6 AHP,you see on the right side a white buoy with orange bands and diamond. This buoy marks().

A.a cable crossing
B.a sunken barge
C.a submerged discharge pipe
D.the end of a wharf

4.单项选择题As the temperature of the air reaches the dew point,().

A.rain must develop
B.fog may form
C.it begins to snow
D.water freezes

5.单项选择题As the temperature of an air mass decreases,the().

A.absolute humidity decreases
B.relative humidity increases
C.specific humidity decreases
D.dew point rises

6.单项选择题As the South Equatorial Current approaches the east coast of Africa,it divides with the main part flowing south to form the warm().

A.Agulhas Current
B.Canary Current
C.Benguela Current
D.Madagascar Current

7.单项选择题As seen from the tow,what should connect the leading ends of both towing bridle legs to the main towing hawser?()

A.A cable clamp
B.A fishplate,flounder,or towing plate
C.A pad eye
D.The towing bitts

8.单项选择题As it approaches,a typical warm front will bring().

A.rising temperatures and falling barometric pressure
B.falling temperature and pressure
C.falling temperatures and rising pressure
D.rising barometric pressure and temperatures

10.单项选择题As compared to carbon dioxide,dry chemical has which advantage?()

A.Cleaner
B.Effective on metal fires
C.Greater range
D.More cooling effect