【C7】A．bearingB．presenceC．signD．trace

A．markB．signalC．signD．form

The gudgeon pin is carried in _____ in the piston skirt.A.the bearingB.the crossheadC.boss

The main bearing metal is a lining _____.A.inside the bearingB.outside the bearingC.coveri

They waved the white flag as a ______ that they wish to surrender.A．markB．signalC．signD．ge

【C7】A．watchedB．followedC．inspectedD．traced

Measure _____ by means of lead wire.A.the clearance of the main bearingB.the play of the m