Cross scavenging requires the fitting of （） to prevent air or exhaust gas escape when the piston is at the top of the stroke.<br>A:a exhaust valve<br>B:a piston skirt<br>C:a piston crown<br>D:an air suction valve

Cross scavenging requires the fitting of （） to prevent air or exhaust gas escape when the piston is at the top of the stroke.
A:a exhaust valve
B:a piston skirt
C:a piston crown
D:an air suction valve

出自：海船船员证

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