單項選擇題In restricted visibility, a vessel which detects by radar alone the presence of another vessel shall determine if a close quarters situation is developing or risk of collision exists. If so, she shall（）.

A.sound the danger signal
B.when taking action, make only course changes
C.avoid altering course toward a vessel abaft the beam
D.All of the above


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1.單項選擇題In revised editions of admiralty charts the（）are corrected first.

A.smaller scales
B.larger scales
C.smaller scales and larger scales
D.moderate scales

2.單項選擇題In the doldrums you can expect（）.

A.steady, constant winds
B.frequent rain showers and thunderstorms
C.steep pressure gradients
D.low relative humidity

3.單項選擇題In the doldrums you will not have（）.

A.high relative humidity
B.frequent showers and thunderstorms
C.steep pressure gradients
D.frequent calms

4.單項選擇題In the northern hemisphere, the largest waves or swells created by a typhoon or hurricane will be located（）.

A.in the southeast quadrant of the storm
B.directly behind the storm center
C.forward and to the right of its course
D.behind and to the left of its course

5.單項選擇題In weather report, position good means that（）.

A.the position is suitable
B.the position is reliable
C.the position is changeable
D.the position is fixable