【单选题】When being assisted by an ice breakerit is important to maintain a continuous listening watch on()and to maintain a proper lookout for sound and visual signals.
A.
the appropriate VHF channel
B.
the HF SSB voice channel
C.
the appropriate SART band
D.
the appropriate EGC channel
【单选题】【单选】As required by COLREG, all ships shall ______ a proper radar lookout if it is available onboard to obtain early warning of risk of collision.
【单选题】JavaScript 中的DOM节点类型不包括:
【单选题】在党的十九届一中全会上,选举( )为中央委员会总书记。