单选题 Some mariners______ change speeds and so pay more attention to factors that support their cruising speeds and less attention to factors that indicate a need to slow down.

单选题 Rule 14 of COLREG requires action______power-driven vessels approaching each other on reciprocal or near-reciprocal course so as to involve the risk of collision.

单选题 Risk of collision would not exist for two slow-moving vessels 20 miles apart heading for the same spot of water,____would it practically exist for two vessels passing a half mile apart in a busy harbor.

单选题 The closest point of approach may represent a safe passing distance with the approaching vessel while at the same time______

单选题 A vessel passing close to a bank or close to another vessel generates hydrodynamic forces________.

单选题 ______risk of collision must be discovered early enough for each vessel to be able to carry out its obligations under the Rules.

单选题 When at sea,the technique taking of compass bearings for determining the risk of collision depends on______

单选题 Most of Rule 6 of COLREG presents factors that must be considered in______

单选题 The mariner who assumes an approaching vessel will pass well clear after making a couple of long-range radar observation______