题目

They discussed ________ they could settle the problem without others' help. A. if           B. that                  C. what            D. whether 答案：D16．如图所示，两个电阻的阻值均为100Ω，A、B两端的电压保持12V不变，现用一个内阻为1.45kΩ 的电压表去测量某个电阻两端的电压，读数为（　　）A．6 VB．5.8 VC．5.2 VD．6.8 V