单项选择题

Before "stand-by" is rung on the engine telegraph, it is usual to give the main engine （） ahead and astern.

A.a brief trial with turning gear
B.a brief trial on power
C.a long trial by steering gear
D.one minutes trial with windlass

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单项选择题
Bedplates are the （） of the engine, without the support of which the shaft alignment in particular, and engine structure as a whole, would inevitably be lost.

A.hull
B.projection
C.graphitization
D.foundation
单项选择题
Because the castings of smaller engines are not so big and heavy, （） and cylinder block may be made in one piece.

A.the column
B.the jacket
C.cylinder cover
D.cylinder liner
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