在建筑内部装修中，不属于疏散楼梯间检查内容的是（）。 A.平面布置 B.设置形式 C

如图所示，已知R₁＞R₂，C₁＝C₂，当S断开时，C₁内有一带电粒子处于平衡状态，下面叙述正确的是               （   ）

①S断开时，C₁、C₂电量之比为1∶1

②S闭合后，C₁、C₂电量之比为R₁∶R₂

③S闭合后，C₁内的带电微粒向上加速运动

④S闭合后，B点电势降低

A．②③

B．①③

C．①②④

D．③④

The salesman showed her several MP3s and she chose ________ one as she didn't want to spend too much money on it.

A．the less expensive

B．less expensive

C．the least expensive

D．least expensive

大型露天矿的服务年限应为多少年？

作业完毕后电焊机为什么要断电拆除电源线？

Soon, more of the information we receive via the Internet could come (6) in digital wrappers. Wrappers are made up (7) software code that’s targeted to do specific things with the data (8) within them, such as helping to define queries for search engines. They also keep (9) from (10) access to that code.

A．close

B．closed

C．enclose

D．enclosed