向溶剂转移,主要是影响产品分子量及其分布.
参考答案:对
---Mary, I heard there was an explosion in Luzhou. Could you tell me how it _______?
---Sorry, I don’t know much about it either.
A.came on
B.came about
C.came out
D.came over
什么是说服法?小学德育过程中运用这一方法的基本要求有哪些?