【判断题】在莫尔法测定溶液中Cl-时,若溶液酸度过低,会使结果由于AgO的生成而产生误差。
【单选题】Where have you been ? — I_______in the heavy traffic .Otherwise I_______ here earlier.
A.
have got stuck; would have come
C.
got stuck ; would have come
D.
had stuck ; would come
【单选题】Jean was so inexperienced that she felt unable to ______ heavy traffic.
【判断题】晶体管的特征频率 是指晶体管共射电流放大倍数 下降到0时的频率。
【判断题】在莫尔法测定溶液中的Cl-时,若溶液酸度过低,会使结果由于AgO的生成而产生误差。
【简答题】由于大带轮的包角( )(大于,小于,等于)小带轮的包角,打滑一般首先发生在( )带轮上。
【单选题】特征频率是指晶体管共射电流放大倍数β等于( )的频率