單項(xiàng)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


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1.單項(xiàng)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

2.單項(xiàng)選擇題The currents are()mosoonal origin.

A.from
B.on
C.in
D.of

3.單項(xiàng)選擇題The emergency signal for fires is sounded on the ship’s whistle and general alarm as().

A.a continuous ringing for 10 seconds
B.one short ring followed by one long ring
C.two long rings of at least 20 seconds
D.a continuous ringing until the fire is extinguished

4.單項(xiàng)選擇題The engine()smoke and steam.

A.gives up
B.gives away
C.gives in
D.gives off

5.單項(xiàng)選擇題The entries in the official logbook must be signed by the master and().

A.the chief engineer
B.the person about whom the entry concerns
C.one other crew member
D.no other signature is required