题目

某实验小组欲精确测量某电阻的阻值,可使用的器材有:被测电阻,阻值20Ω左右;电流表(量程04A,内阻约为0.5Ω);电流表(量程0.1A,内阻=1Ω);电流表(量程3.0A,内阻约为0.1Ω);各种规格的定值电阻若干;滑动变阻器(阻值0~5.0Ω);滑动变阻器(阻值0~1000.0Ω);电源E(电动势6V,内阻不计);开关K;导线若干.(1)某同学设计了测量电阻的实验电路图如图所示,①中应选用元件____②中应选用元件_____分别选填“”、“”或“”),滑动变阻器应选元件____-(选填“或“”)(2)为了便于操作、测(B) 根据句意，写出括号内所给单词的适当形式。1.Papi Jiang has been the ______ (hot) Internet star since last October.2.The lady must be in her ______ (thirty) by now, but she still looks young3.It’s not easy to find out the ______ (true) of the event in such a short time.4.If you drink too much water all at once, it will ______ (simple) pass through you, with little or no good for your body.