Pollution regulations require that each scupper in an enclosed deck area have a（）.<br>A:wooden plug<br>B:soft rubber plug<br>C:two-piece soft patch<br>D:mechanical means of closing

Pollution regulations require that each scupper in an enclosed deck area have a（）.
A:wooden plug
B:soft rubber plug
C:two-piece soft patch
D:mechanical means of closing

出自：海船船员证

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