具有结构紧凑、运行可靠、维护方便、节省蒸汽、适应单元制机组的滑参数启动等特点的抽气器

根据对话内容，从对话后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

— Good morning. 1______. 

— Yes. I'd like some information about English courses in your college. 2______ 

— Yes, there's a beginners' course on Monday evenings at 7:30.

— On Monday? 3______

— Yes, I'm afraid so.

— Well. 4______ But do you think you'll have a course on some other night in the future? 

— Well. 5______ Perhaps we will offer one in the future.

A. I work on Mondays, so I'm afraid that's no good for me.

B. Do you have any courses for complete beginners?

C. Is that the only course you've got?

D. Why not come earlier?

E. Can I help you?

F. I want to have English lessons.

G. Wait for some time, please.

“仁者见仁，智者见智”，是对客观真理的否定。

下列商业网络组织形式中，能反映现代商业发展潮流的是[ ]

A、货郎担、大篷车

B、电子商务、网上购物、无人自动售货

C、专业化超市、连锁店

D、商业步行街、休闲购物广场

移动电子商务应该满足的要求？

混凝土搅拌的最短时间与（）等因素有关。

A.混凝土配合比

B.骨料的品种

C.搅拌机的类型和容量

D.混凝土的用途

E.对混凝土流动性的要求