It is well known that good lubrication will （） the bearing

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[单选题]It is well known that good lubrication will （） the bearings from becoming overheated.

A. present
B. prevent
C. avoid
D. provide

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[单选题]If （） are taken at regular intervals, any unequal distribution of load will be easily found out.

A. differential of crank-webs
B. indicator diagrams
C. lube oil reading out
D. misalignment of crank-throw

[单选题]The indicated power of an engine can be obtained by taking the （）.

A. precautions
B. rpm
C. indicator cards
D. B and C

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