A.不正確 B.正確 C.振鈴幅度應(yīng)為0.2
A.計(jì)算鍵值 B.按鍵值轉(zhuǎn)向相應(yīng)的功能程序 C.計(jì)算鍵值并轉(zhuǎn)向相應(yīng)的功能程序 D.判斷是否有鍵按下
A.口線為高電平,對(duì)應(yīng)數(shù)碼管顯示 B.口線為低電平,對(duì)應(yīng)數(shù)碼管顯示 C.數(shù)碼管顯示不能根據(jù)口線高低電平確定