有害气体浓度/%Vol | … | 5 | 7.5 | 10 | 12.5 | 15 | … |
R/Ω | … | 5.2 | 3.9 | 3 | 2.5 | 2 | … |
A.2:3:4 | B.3:4:7 | C.2:1:4 | D.4:2:1 |
A.等于6V | B.大于3V | C.等于3V | D.小于3V |
A.通过电阻R的电流时0.6A | B.电阻R两端的电压是2V |
C.通过灯泡L的电流时0.2A | D.灯泡L两端的电压是2V |
A.变阻器电阻增大 |
B.电流表示数减小 |
C.小灯泡亮度增大 |
D.变阻器两端电压增大 |
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