單項選擇題It has often been stressed in the Courts that the look-out man should,preferably,be stationed forward,unless weather conditions make this().

A.possible
B.practicable
C.impossible
D.probably


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3.單項選擇題In restricted visibility a towed vessel must sound a fog signal when it is().

A.the last vessel in the tow
B.the last vessel in the tow and it is carrying a crew
C.manned,regardless of its position in the tow
D.None of the above are correct

4.單項選擇題In reduced visibility,you hear two prolonged blasts of a whistle. This signal is sounded by a ().

A.power-driven vessel dead in the water
B.sailing vessel on the port tack
C.vessel not under command
D.vessel fishing with nets