A.G=(2-
| B.G=(
| C.G=(
| D.G=kIL |
G |
K |
L-x |
L |
L-
| ||
L |
E |
R0+R′ |
E |
IR0 |
A.R0 | B.R0+r | C.R0-r | D.0 |
A.φa>φb,20V | B.φa>φb,100V | C.φa<φb,20V | D.φa<φb,100V |
A.灯L1短路 | B.灯L2短路 | C.灯L1断路 | D.灯L2断路 |
A.R1两端的电压增大 | B.电流表的示数增大 |
C.小灯泡的亮度变强 | D.小灯泡的亮度变弱 |
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