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單項選擇題

The changes in the channel’s sands and buoys on this coast are（）this chart can not be considered as a safe guide of the channel.

A.frequent
B.so frequent
C.frequent that
D.so frequent that

單項選擇題

The common way to obtain your ship’s position is（）.

A.keeping a close watch and lookout
B.taking a radar range and bearing
C.observing a radar target and listening to signals
D.keeping a well clear caution