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【简答题】
4个1Ω的电阻串联,总电阻是( )
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举一反三
【简答题】试验电荷必须满足两个条件:第一,它必须是______电荷;第二,它的电荷应足够______。
【单选题】如图所示的液压回路,已知溢流阀的调定压力 P y =5MP a ,减压阀的调定压力 P j =,3 MP a ,当液压缸空载运行时 P 1、 P 2 为( )
A.
0 ， 0
B.
5MP a ， 3MP a
C.
5MP a ， 0
【单选题】190 The way a project manager sends and receives information depends upon:
A.
How others relate to the project manager
B.
The project manager's level in the organizational hierarchy
C.
the size and nature of the project
D.
the project manager's salary and age
E.
the number of projects going on at one time in the company
【单选题】108 The way a project manager sends and receives information depends upon:
A.
How others relate to the project manager
B.
The project manager's level in the organizational hierarchy
C.
the size and nature of the project
D.
the project manager's salary and age
E.
the number of projects going on at one time in the company
【简答题】设随机变量X服从参数为λ的泊松分布，且P(X=0)= ，则P(X≥1)=_________
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