问题描述：
[单选]
The exhaust gases for a new engine should be（）when the engine operates under full load．
A．smoky
B．a little bit dense
C．visible
D．almost invisible
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答案解析：无
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上一篇：The external circumference of a pair of main bearing shells is slightly larger than that of the bore of the housing which receives themThe difference is termed（）．
下一篇：The engine will fail to start unless（）．
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