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單項選擇題

The fog is lifted，so（）the radar．

A.close
B.open
C.switch off
D.switch on

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單項選擇題

The external flotation bladder of an immersion suit should be inflated（）.

A.only after two hours in the water
B.only after four hours in the water
C.before entry into the water
D.upon entry into the water

單項選擇題

The dumping of refuse in a lock is permitted（）.

A.when approved by the lockmaster
B.when locking downbound
C.at no time
D.during high water only