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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A.close the vent
B.pump out the tank
C.activate the fixed CO2 system
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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
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In order to remove the carbon deposit from the threaded recess, we can use（）
A.a driver
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C.a tap
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