第四代电子计算机主要采用中、小规模集成电路元件制造成功。
参考答案：错
" Never ______ time come again," his teacher said to him. [ ]
A. lose
B. losing
C. lost
D. will lost
若持续10周给小鼠饲以80mg./kg体重的苯甲酸，可致小鼠32%死亡。
