【简答题】安静时主要产热器官是 ______ 。 运动时 主要产热器官是 ______ 。
【单选题】对于迷宫式密封的组装,主要是( )的调整。
【单选题】葡萄胎声像图上,多数直径3~5mm无回声的囊泡,最大可能是什么
【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