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

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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

單項(xiàng)選擇題

For determining the amount of chains used in anchoring operation,which one of the following factors wouldn’t be considered?（）.

A.selection of landmarks
B.character of sea bottom
C.strength of current and wind force
D.radius of ship swing to wind or tide

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