【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】设三角形三边长分别为a,b,c, 能 判断是否满足 构成三角形的C语 言表达式是( )
C.
a>0&&b>0&&c>0||a+b>c||a+c>b||b+c>a
D.
a>0&&b>0&&c>0&&a+b>c&&a+c>b&&b+c>a
【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。