范德华力是固体表面产生物理吸附和气体凝聚的原因,主要来源于三种不同的力,其中静电力主 发布时间:2018-10-16 15:43 │ 来源:www.tikuol.com 题型:单项选择题 问题: 范德华力是固体表面产生物理吸附和气体凝聚的原因,主要来源于三种不同的力,其中静电力主要发生在()之间。A.极性分子B.非极性分子C.极性分子与非极性分子D.分子与原子
题型:单项选择题 17. They can't be working now. It's time they ________ the office.A.have leftB.would leaveC.could leaveD.left 查看答案
题型:单项选择题 句型转换。1. He has to study for the maths test. (改为一般疑问句) ______ he ______ to study for the maths test? 2. —Would you love to play basketball with us? (给出肯定答语) —Yes, I'd ______ ______. 3. Can you come to my party? (给出否定答语) ______, I ______. 4. It is Tuesday. (对画线部分提问) ______ day ______ today? 5. I'm playing football. (对画线部分提问) ______ ______ you _______? 查看答案