属于对旅游交通服务采购形式的为（）A、航空交通服务采购 B、铁路交通服务采购 C、公路交

Some day I happened to find a chatting room in my QQ, there people were chatting in English. I tried to chat with some of them. To my surprised, I found the oral English of some junior students were better than me. I asked them for advice and they told me to practise more on QQ. But every day after that I would spend one hour practise my oral English on QQ. Day by day I learned from many useful words and expressions. With time went by, I found that I could even communicate some college students freely.

箱式变压器的高压室一般是由（）、（）和（）等组成的，可以进行停送电操作并且有（）和（）。

以下哪个结构简图中的支座没有水平推力（）

A.A

B.B

C.C

D.D

设置钢筋混凝土构造柱的墙体，砖的强度等级不宜低于( )。

A．MU5

B．MU7.5

C．MU10

D．MU15

卷杀