离心式压缩机为什么要有那么高的转速？

After I moved to Guangzhou, it took me two months to ______ here.

A．be used to live

B．use to live

C．used to living

D．get used to living

The number of students in our school       about 3,000 and       them are from the countryside.

A．is; a large deal of

B．are; a number of

C．are; large deal of

D．is; a large number of

在上海证券交易所，（）是指特定时点不能按照虚拟开盘参考价格虚拟成交并予以即时揭示的买方或卖方剩余申报数量。

A.虚拟匹配量

B.虚拟未匹配量

C.匹配量

D.未匹配量

华佗最精通的医术是：

A．按摩

B．四诊法

C．治疗外科病

D．中医学理论

简述确定外圆车刀前角大小应考虑的因素。