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
参考答案:B
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
参考答案:B