凝集反应形成的反应现象()
A.肉眼可见
B.肉眼不可见
C.必须用精密仪器测定
D.必须染色才可见
E.必须借助显微镜
参考答案:A
大型加氢裂化装置开工时,引入的低氮开工油的进料流率为正常设计进料量的()。
A、50%
B、60%
C、70%
D、80%
用所给的单词的正确形式填空,每个词只用一次
short, want, ,it, clothes, good
小题1:They eat _____ and they are healthy.
小题2:Does Lucy _______ to have a big bookcase?
小题3:Dave likes sports, but he doesn’t play _______.
小题4:The trousers are too long for her. She is _______.
小题5:Come to see the new _______ in Rose Store!