题型:计算题 如图所示,R1=2kΩ,R2=3kΩ,电源内阻可忽略。现用一电压表测电路路端电压,示数为6V;用这电压表测R1两端,电压示数为2V。(1)那么电压表内阻为多少?(2)如用这电压表测R2两端电压,示数是多少? 查看答案
题型:选择题 We shouldn’t spend our money testing so many people, most of ____ are healthy.A.thatB.whichC.whatD.whom 查看答案