趾外翻的诊断标准是第1跖骨长轴与趾近节趾骨长轴所形成的夹角(即趾外翻角)大于()
A. 5°
B. 10°
C. 15°
D. 20°
E. 25°
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You hear the fog signal of another vessel forward of your beam.Risk of collision may exist.You MUST().
A. Reduce speed to bare steerageway
B. Stop your engines
C. Begin a radar plot
D. All of the above
总线是连接()、()和()的公共信息通道。通常由三部分组成:()、()、() 。