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[单选题]
图2-2所示电路中,u1=400sinωtV,u2=-300sinωtV,则u=()。
图2-2所示电路中,u1=400sinωtV,u2=-300sinωtV,则u=()。![图2-2所示电路中,u1=400sinωtV,u2=-300sinωtV,则u=()。](https://img2.soutiyun.com/xilvedu/2020-09-10/968580543313972.png)
A.700sinωtV
B.500sinωtV
C.100sinωtV
D.50sinωtV
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A.700sinωtV
B.500sinωtV
C.100sinωtV
D.50sinωtV
A.700sinωtV
B.500sinωtV
C.100sinωtV
A.Iz2=Iz1+(a+H/2)2BH
B.Iz2=Iz1-a2BH-(H/2)2BH
C.Iz2=Iz1-a2BH+(H/2)2
D.Iz2=Iz1+(H/2)2BH
A、GRANT SELECT TO SC ON U1 WITH PUBLIC
B、GRANT SELECT ON SC TO U1 WITH GRANT OPTION