向計數(shù)器(正反向計數(shù)器) bidirectional counter: 雙向計數(shù)器forward counter: 正向電流; 正向計數(shù)器back counter: 后跟內(nèi)保強(qiáng);后幫back in counter: 后內(nèi)外勾形back to back counter: 加倍計數(shù)器下載手機(jī)詞典可隨時隨地查詞查翻譯