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單項選擇題

When visibility is 10 nautical miles, we say that visibility is（）.

A.very good
B.good
C.poor
D.moderate

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單項選擇題

When visibility is about 1 nautical mile only, we say that visibility is（）.

A.very
B.good
C.moderate
D.poor

單項選擇題

When within the entrance, the vessel should（）surf islet.

A.navigate
B.arrive at
C.steer for
D.maneuver for