The exhaust gases for a new engine should be （） when the engine operates under full load.<br>A:smoky<br>B:a little bit dense<br>C:visible<br>D:almost invisible

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

出自：海船船员证

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