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單項(xiàng)選擇題

The Local Notice to Mariners is usually published（）.

A.daily
B.weekly
C.monthly
D.semiannually

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單項(xiàng)選擇題

The issue of Notices to Mariners of charts and these aids(Radar beacons)may be delayed until such time as they are assessed to be（）.

A.temporary
B.permanent
C.occasional
D.steady

單項(xiàng)選擇題

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

A.before you enter the water
B.after you enter the water
C.after one hour in the water
D.after you notice that your suit is losing buoyancy