方程2x-2+xx+1=3x2-x-2的解是( ) A.1 B.-1 C.±1 D.方程

题型:选择题

问题:

方程
2
x-2
+
x
x+1
=
3
x2-x-2
的解是(  )
A.1B.-1C.±1D.方程无解
考点:解分式方程
题型:选择题

根据句意和首字母提示,完成短文。

We usually buy things in a shop, a market or a supermarket. Shopping always takes too much t____小题1:____ . We have to walk around for a long time to look f_____小题2:__ the things we want. Sometimes we have to c____小题3:___ many heavy shopping bags. We’re always very tired(疲劳的) after s_____小题4:____. Now it’s different from that in the past(过去). We can do many things at h____小题5:____, we don’t need to go to the shop. We can buy many good and c___小题6:____ things on the Internet, they look nice but don’t cost much. It seems easy and quick, b___小题7:____ it sometimes brings us some trouble(麻烦). The clothes you buy on the Internet are d____小题8:____ from what you want, or the size is too s____小题9:___ or too big. You may see many people wear the same clothes in the street. Do you know why? B_____小题10:__ they all buy clothes on the Internet. How interesting!

题型:选择题

()安全技术是指为了防止事故的发生,采取的约束、限制能量或危险物质,防止其意外释放的技术措施。

A.减少事故损失的

B.电气

C.防止事故发生的

D.防火防爆

题型:选择题

在整流电路的输出端并一个电容,利用电容的()特性,可以使脉动电压变得较平稳,这个电容叫()电容。

题型:选择题

表示病例组与对照组两组的暴露率有无统计学的显著差异()

A.OR

B.RR

C.95%CI

D.χ2

E.AR%

题型:选择题

下列药物不属于心境稳定剂的是()

A.碳酸锂

B.拉莫三嗪

C.丙戊酸钠

D.卡马西平

E.SSRIs

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