【判断题】SDS-PAGE电泳时,上面为分离胶,下面为浓缩胶。
【单选题】炼钢工人可通过看钢样火花来判断钢水含C量,当C<0.10%时
【单选题】In orde to make the hired childre do their best the college students at one time .
A.
gave them a sound beating
B.
offered them competitive bonuses
C.
promised to pay them in advance
【单选题】Do you know nearly ________of our body is water?
【简答题】The family man? Father was a hardworking man who tried his best to support his wife and three children. He spent all his evenings attending classes, hoping to improve himself so that he could one day ...
【单选题】What does the author think teachers do which they should not do? ______
A.
They give children correct answers.
B.
They point out children's mistakes to them.
C.
They allow children to mark their own work.
D.
They encourage children to copy from one another.