單項(xiàng)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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1.單項(xiàng)選擇題When visibility is about 1 nautical mile only, we say that visibility is（）.
A.very
B.good
C.moderate
D.poor
2.單項(xiàng)選擇題When within the entrance, the vessel should（）surf islet.
A.navigate
B.arrive at
C.steer for
D.maneuver for
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