等于()。
A.0.6
B.0.7
C.0.8
D.0.9
参考答案:B
有R1,R2和R3三只电阻,已知R1>R2>R3,连接成如图所示三个电路,电源电压相等。其中R1两端电压最大的是( )
A.甲图
B.乙图
C.丙图
D.无法确定[
Tiny Tim, a character in A Christmas Carol, was a happy little boy in spite of the disability that caused him a weakness in one leg.
A.to limp
B.to fall
C.rest
D.suffer