單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題Bearing knocks are likely to occur from （）.

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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題At the top of the A-frames there is a strong cast iron frame called （）.

A.cylinder liner
B.cylinder cover
C.the gear box
D.the scavenging box