问题描述：
[单选]
The carbon deposits on the piston crown and in the ring grooves（）．
A．should be scraped
B．should be derusted
C．should be drilled out
D．to be brushed off
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答案解析：无
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答案解析：无
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上一篇：The cast iron（）for the cross-head are attached to the top section and seal off the crankcase．
下一篇：The cap and new shell are tightened up and then removed and the thickness of the wire measured by（）．
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