單項選擇題A distance piece, with ground faces, may be interposed between the rod and the bearing housing, its thickness being chosen to ensure the correct （）.

A.expansion ratio
B.pressure ratio
C.compression ratio
D.clearance ratio


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2.單項選擇題A distance piece, known as a （） may be interposed between the rod and the bearing housing.

A.bearing shell
B.bearing liner
C.compression plate
D.lead wire

3.單項選擇題A diesel engines crankcase oil level is found to be too high√ You should suspect that （）.

A.the engine was over filled
B.there might be a fuel leak
C.there might be a water leak
D.all of the above

4.單項選擇題A diesel engine is similar to a gasoline engine except that the former has no （）.

A.cross-head
B.cylinder
C.connecting rod
D.spark plug

5.單項選擇題A common trouble with the fuel pump plungers or fuel valve spindle is （）.

A.broken down
B.stuck
C.oil leakage
D.carbonized