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【单选题】
已知点A(20,0,0)和点B(20,0,10),关于点A和点B的相对位置说法正确的是A.
点B在点A正前方
B.
点A在点B正前方
C.
点A在点B正下方,且重影 在OX轴上
D.
点B在点A正上方,且重影于V面上
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举一反三
【单选题】What happens when the operator dials the shore ID followed by the“#”sign in initiating a voice call via Inmarsat standard-B?
A.
The telephone operator comes on.
B.
A steady tone is heard.
C.
A ring-back tone is heard for about l..5 seconds.
D.
A wailing tone is heard.
【单选题】When initiating a DSC call-for public correspondence to coast station or another ship, the operator should key in() of the station to be called on the DSC terminal.
A.
a)、the MMSI
B.
the MID
C.
the four digit selcall number
D.
the five digit selcall number
【单选题】What is usually the first step for a GMDSS radio operator to take when initiating a distress priority message via Inmarsat?
A.
By dialing the correct code on the telephone remote unit.
B.
By pressing a"Distress Button" or "Distress Hot Key(s)”on ffie equipment.
C.
By contacting the CES operator and announcing a distress condition is in existence.
D.
By contacting the CES operator using the radiotelephone distress procedure "Mayday".
【简答题】调类就是声调的 ________________ ,也就是把( )。
【简答题】调类是声调的种类，就是把——相同的字归纳在一起所建立的类。
【简答题】调类是声调的种类,就是把( )相同的字归纳在一起所建立的
【简答题】调类就是()的种类。
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