A.V=60×N/K(N為每秒鐘的計(jì)數(shù)個(gè)數(shù),K為標(biāo)記的數(shù)量或者齒輪的個(gè)數(shù)) B.V=N/(60K) C.V=60×K/N D.V=K/(60N)
A.半導(dǎo)體薄片 B.永久磁場(chǎng) C.電場(chǎng) D.信號(hào)轉(zhuǎn)換電路
A.發(fā)光二極管 B.光敏三極管 C.信號(hào)轉(zhuǎn)換電路 D.場(chǎng)效應(yīng)管