工作电路pull: vt. 1.拉,拖,牵,曳 (opp. push); 勒 ...up: adv. (superl. uppermost ) 1. ...circuit: n. 1.(某一范围的)周边一圈;巡回,周游;巡回路线[ ...active pull-up circuit: 有源负载电路passive pull up circuit: 被动上牵电路下载手机词典可随时随地查词查翻译