题目内容

Theintakevalvesinadieselenginearereseatedby（）.

A. camfollowers
B. pushrods
C. combustiongases
D. valvesprings

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A. If
B. Providedthat
C. Should
D. When

A. On
B. At
C. During
D. In

A. thehighestpointinthesystem
B. thelowestpointinthesystem
C. nearthefloor
D. platelevelornearthetanktoplevel

A. camshaftbeatings
B. mainbearings
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