A.PCIB.EISAC.RS232CD.ISA
A.可產(chǎn)生周期性負脈沖B.多用作方波發(fā)生器C.必須由GATE信號上升沿啟動計數(shù)D.由GATE信號上升沿繼續(xù)計數(shù)
A.33441122B.44332211C.11223344D.22114433