A.30 B.45 C.60 D.90
A.25 B.30 C.45 D.90
A.“L”端暫時不接被試品,驅(qū)動兆歐表至額定轉(zhuǎn)速,其指針應(yīng)指“∞” B.“E”端暫時不接被試品,驅(qū)動兆歐表至額定轉(zhuǎn)速,其指針應(yīng)指“0” C.“G”端暫時不接被試品,驅(qū)動兆歐表至額定轉(zhuǎn)速,其指針應(yīng)指“0” D.“E”端暫時不接被試品,驅(qū)動兆歐表至額定轉(zhuǎn)速,其指針應(yīng)指“∞”