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

A.less clearance
B.dirty lube oil
C.overload
D.bearing wear
单项选择题
Be sure to make the engine turn by （） before starting and after stopping .

A.steering gear
B.turning gear
C.steering wheel
D.turning cycle
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