【单选题】葡萄胎声像图上, 3 ~ 5mm 直径的大量无回声结构,最大可能是什么?
【单选题】A vessel which detects ______ the presence of another vessel shall determine if a close-quarters situation is developing and /or risk of collision exits.
B.
by long-range scanning
C.
by systematic observation
D.
by all available means
【单选题】对于迷宫式密封的组装,主要是( )的调整。
【单选题】对于迷宫式密封的组装,主要是( )的调整。
【单选题】In restricted visibility, a vessel which detects by radar alone the presence of another vessel shall determine if a close quarters situation is developing or risk of collision exists.If so, she shall ...
A.
sound the danger signal
B.
when taking action, make only course changes
C.
avoid altering course toward a vessel abaft the beam