單項(xiàng)選擇題It is during （） that work energy is being put into the engine; during the other 3 strokes of the piston, the engine is having to do the work.

A.the suction stroke
B.the compression stroke
C.the expansion stroke
D.the exhaust stroke


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1.單項(xiàng)選擇題Which of the following operations aboard a tanker must be recorded in the Oil Record Book （）

A.Any internal transfer of oil cargo during a voyage
B.The discharge overboard in port or at sea of any bilge water accumulated in machinery spaces
C.The loading or unloading of any or all oil cargo
D.All of the above

3.單項(xiàng)選擇題Which of the following statements describes one of the functions of the ballast system?（）

A.To permit flooding of any fuel oil storage tank on any class of ship
B.To use it as a secondary service system
C.To store reserve feed or potable water for extended cruises
D.To stabilize the ship by flooding certain designed tanks with seawater

4.單項(xiàng)選擇題The abbreviation "GM" is used to represent the （）

A.height of the metacenter
B.fighting arm
C.righting moment
D.metacentric height

5.單項(xiàng)選擇題A segregated ballast system is a system where （）

A.all ballast is processed through the oily water separator
B.ballast is taken on and discharged through a separate main deck riser
C.ballast and cargo tanks are separated by cofferdams
D.all ballast lines, tanks, and pumps are independent of those used for oil