單項(xiàng)選擇題

For an upright vessel, draft is the vertical distance between the keel and the（）.

A.waterline
B.freeboard deck
C.plimsoll mark
D.admidships section

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單項(xiàng)選擇題

For any given pedestal crane,when the boom is lengthened, the lifing capacity is（）.

A.unchanged
B.increased
C.eliminated
D.decreased

單項(xiàng)選擇題

For cargoes（）grain meals,coal,ventilation is needed to prevent them（）spontaneous combustion.

A.i.e./of
B.for instance/away
C.for example/off
D.such as/from