Insufficient space between the hull and bottom in shallow water will prevent normal screw currents resulting in （）.

Information on the operating times and characteristics of foreign radiobeacons can be found in which publication? （）

A.List of Lights
B.Coast Pilot
C.Sailing Directions
D.List of Radiobeacons

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If the officer on watch is in any doubt as to the pilot’s actions，or intentions，he should （）.

A.notify the Captain as soon as possible
B.seek clarification from the pilot
C.take action by his own judgment
D.cease the duty of pilot's at once

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