题目

如图是酒精测试仪的原理图,R0为定值电阻.已知酒精气体传感器的电阻与酒精气体的浓度成反比,如果测试到的酒精气体浓度越大,那么( ) A . 传感器的电阻越大 B . 电压表的示数越大 C . 通过传感器的电流越小 D . 电路消耗总功率越小 答案:B “When ______ repair the machine again?” “When ______, I’ll tell you.” [  ] A.the man will, he comes B.will the man, he will C.does the man, will he come D.will the man, he comes
物理 试题推荐