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

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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
单项选择题
Bearing knocks are likely to occur from （）.

A.less clearance
B.dirty lube oil
C.overload
D.bearing wear
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