單項(xiàng)選擇題Halon fire extinguishers are NOT effective when used on which types of fires?()

A.Fires in electrical equipment
B.Flammable oils and greases
C.Class "A" fires in ordinary combustibles
D.Materials containing their own oxygen


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1.單項(xiàng)選擇題Guide tolerances during elevation of the jack-up rig will().

A.reduce spud can bearing pressure
B.keep the unit level and reduce overloading
C.reduce stresses on the hull
D.minimize the potential for punch-through

2.單項(xiàng)選擇題Great Salt Pond on Block Island is().

A.entered through a dredged cut
B.not accessible in easterly gales
C.available for vessels up to a maximum draft of 8 feet (2.4m)
D.not affected by the tide

3.單項(xiàng)選擇題Good seamanship while towing in heavy weather requires all of the following EXCEPT().

A.reducing speed to reduce surging on the towline
B.lashing down or stowing all loose gear
C.dogging all hatches and watertight doors
D.streaming all of your towing hawser

5.單項(xiàng)選擇題Generally,when lifting an inflatable liferaft back aboard ship,you would use the().

A.towing bridle
B.main weather cover
C.external lifelines
D.righting strap