單項選擇題No navigational aids are shown and the chart is not kept corrected for alterations in depths inside the pecked lines. For more detailed information, the larger scale charts must be（）.

A.referred to
B.appreciated
C. met with
D.concerned


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2.單項選擇題Of the following,（）is not a wind.

A.bora
B.gust
C.gregale
D.floe

3.單項選擇題Risk of collision may be deemed to exist（）.

A.if the compass bearing of an approaching vessel does not appreciably change
B.even when an appreciable bearing change is evident, particularly when approaching a vessel at close range
C.if you observe both sidelights of a vessel ahead for an extended period of time
D.All of the above

4.單項選擇題Risk of collision may exist（）.

A.if the compass bearing of an approaching vessel does not appreciably change
B.even when an appreciable bearing change is evident, particularly when approaching a vessel at close range
C.if you observe both sidelights of a vessel ahead for an extended period of time
D.All of the above

5.單項選擇題Rule 14 describes the action to be taken by vessel meeting head-on. Which of the following conditions must exist in order for this rule to apply?（）.

A.Both vessels must be power-driven
B.They must be meeting on reciprocal or nearly reciprocal courses
C.The situation must involve risk of collision
D.All of the above