A.1A=1000mA
B.1mA=1000μA
C.1μA=1000 mA
D.1A=1000000μA

A.直流电的电流方向一定，大小不变
B.直流电的电流方向一定，大小随时间改变
C.交流电的电流大小方向随时间作周期性改变
D.电子在金属导线中有规则的流动叫电流

A.0.5
B.0.8
C.1.1
D.1.5

A.60
B.120
C.180
D.210

A.30
B.60
C.120
D.150

A.24
B.48
C.72
D.12

A.10⁶
B.10⁷
C.10⁸
D.10⁹

A.0.25
B.0.5
C.1
D.2

A.10^-5
B.10^-6
C.10^-7
D.10^-8

A.10
B.10²
C.10³
D.10⁴

A.1.01325
B.1.25325
C.0.95325
D.0.85325