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【简答题】
天然宝石一般具备的三大条件为 、 和 。
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反馈参考答案：
举一反三
【单选题】In radiotelephony，the spoken word for distress is ().
A.
Securite
B.
Safety
C.
Emergency
D.
MAYDAY
【简答题】S1:MAYDAY,MAYDAY,MAYDAY.This is MV Blue Sky.I have collided with an unknown object.I am sinking.Over.S2:MV Blue Sky,this is Eastern station.Report your position.Over.Q:What has happened to MV Blue Sky...
【单选题】Mayday is to be used to announce ______.
A.
a distress message
B.
an urgency message
C.
a safety message
D.
a message of SMCP
【单选题】MAYDAY is to be used to announce________.
A.
a distress message
B.
an urgency message
C.
a safety message
D.
a massage of SMCP
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