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單項選擇題

Measure （） by means of lead wire.

A.the clearance of the main bearing
B.the diameter of main bearing
C.the hardness of main bearing
D.the tolerance of main bearing

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單項選擇題

Measure （） by means of lead wire.

A.the clearance of the main bearing
B.the play of the miler bearing
C.the gap of the main bearing
D.the tolerance of the main bearing

單項選擇題

Marine four-stroke diesel engines are mainly （）.

A.of crosshead type
B.of trunk piston type
C.of low speed type
D.all the above

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