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【单选题】
使用无线电传建立安全通信时,紧急呼叫标志符:A.
是“PAN PAN”,发送3次
B.
是“PAN PAN”,发送1次
C.
是“SECURITE”,发送3次
D.
是“SECURITE”,发送1次
拍照语音搜题，微信中搜索"皮皮学"使用
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举一反三
【单选题】We must take part in physical labor in order to ______ ourselves more closely with the working people.
A.
identify
B.
incorporate
C.
combine
D.
involve
【简答题】计算二重积分xInydxdy，其中D：0≤x≤4，1≤y≤e．
【单选题】We all know that programming language is the system of syntax, grammar, and symbols or words used to give instructions to a computer. Because computers work with binary numbers, first-generation langu...
A.
it is used in designing software.
B.
it is hardware-independent.
C.
is should be translated into the computer language by software.
D.
it is designed to solve some specific problem.
【简答题】计算二重积分 ，其中D＝{(X，y)1 0≤X≤1，0≤y≤1}．
【简答题】计算二重积分 ，其中D＝{(x，y)｜0≤x≤1，0≤y≤1)．
【单选题】So far we have done a lot to build a low-carbon economy, but it is ____ ideal (理想). We have to work still harder.
A.
next to
B.
far from
C.
out of
D.
due to
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