单项选择题

All classes of fires can be safely combated using（）

A.foam
B.CO₂
C.low velocity water fog
D.high velocity water fog

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单项选择题

If there were a fire in the bunker tanks, you would（）

A.close the vent
B.pump out the tank
C.activate the fixed CO₂ system
D.cut off the heating coils

单项选择题

Any friction fit, tightness or adhesion of the part of any load being lifted should be broken by wedge or tapping and not by increasing the load on the applianceAccording to this sentence, （）

A.the lifting appliance can always lift the freight within its rated load
B.attention should be paid in order not to break the wedge when lifting cargo
C.sometimes the lifting work needs other assistance other than the lifting appliance
D.lifting work should be done with every part fit, tightness or adhesion

单项选择题

In order to remove the carbon deposit from the threaded recess, we can use（）

A.a driver
B.a scraper
C.a tap
D.a file