All three systems have the ports （） to swirl the incoming air and direct it in the appropriate path.<br>A:angled<br>B:rounded<br>C:being angled<br>D:being rounded

All three systems have the ports （） to swirl the incoming air and direct it in the appropriate path.
A:angled
B:rounded
C:being angled
D:being rounded

出自：海船船员证

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