A.把L1和L4串联后接入电路 |
B.把L2和L4串联后接入电路 |
C.把L1和L3串联后接入电路 |
D.把L2和L3串联后接入电路 |
P1 |
U1 |
20W |
12V |
5 |
3 |
P2 |
U2 |
10W |
12V |
5 |
6 |
P3 |
U3 |
5W |
6V |
5 |
6 |
P4 |
U4 |
10W |
6V |
5 |
3 |
A.P1>P2,P1′<P2′ | B.P1+P2<P1′+P2′ | ||||||
C.P1+P2=P | D.
|
A.变亮 | B.变暗 |
C.先变亮,后变暗 | D.先变暗,后变亮 |
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