单项选择题
Personnel who are moving or handling material aboard ship should NOT follow which of the listed practices?（）
A.signaling that all personnel are clear before lifting or lowering material
B.Examining material for sharp edges or protruding points before handling
C.Closing, tagging, or securing valves that permit entrance of steam, water, or air into a fitting or other equipment
D.Throwing materials from high places to the deck
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单项选择题
Prior to starting most medium-speed propulsion diesel engines, which of the procedures listed should be observed?（）
A.The expansion tank should be topped off
B.The thermostatic water regulating valves should be manually opened
C.The fuel filters should be changed
D.The engine should be turned over slowly with the indicator cocks open -
单项选择题
The order “（） ” means “Maximum maneuvering engine revolution for ahead propulsion”.
A.Full Ahead
B.Half Ahead
C.Full Astern
D.Half Astern -
单项选择题
Winch gears must be maintained in proper alignment to prevent （）.
A.overheating of the lube oil
B.over-speeding of the motor
C.wear on the braking system
D.damage to the teeth
