A.0 B.5~10μs C.5~10ms D.1s以上
A.計(jì)數(shù)從零重新開始 B.計(jì)數(shù)從初值重新開始 C.計(jì)數(shù)停止 D.由程序決定
A.2FH B.30H C.31H D.#30H