A.7 B.9 C.10 D.11
A.11001011 B.10001011 C.10110011 D.11010011
A.1次 B.2次 C.有幾個觸發(fā)脈沖就翻轉(zhuǎn)幾次 D.觸發(fā)脈沖數(shù)加1