There shall be two principal （） through the harbor for the passage of vessels of over 60 tons burden．<br>A:straits<br>B:channels<br>C:canals<br>D:roadsteads

There shall be two principal （） through the harbor for the passage of vessels of over 60 tons burden．
A:straits
B:channels
C:canals
D:roadsteads

出自：海船船员证

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