等物质的量的钠、镁、铝与足量稀H2SO4反应生成的氢气的物质的量之比是( ) A

题型:选择题

问题:

等物质的量的钠、镁、铝与足量稀H2SO4反应生成的氢气的物质的量之比是(  )

A.1:1:1

B.1:2:3

C.3:2:1

D.6:3:2

考点:化学反应方程式
题型:选择题

男性,45岁,右手远侧指间关节疼痛、肿胀、有晨僵感,活动后可逐渐消失。

此种关节炎病理改变主要表现在()

A.滑膜

B.肌腱

C.韧带

D.关节囊

E.关节软骨

题型:选择题

短文改错。

此题要求改正所给短文中的错误.对标有题号的每一行做出判断:如无错误,在该行右边横线上画一个勾(√);如有错误(每一行只有一个错误),则按下列情况改正:此行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉.此行缺一个词:在缺渊处加一个漏字符号(A);在该行右边横线上写出该加的词.此行错一个词:在错的词下面划一横线,在该行右边横线上写出改正后的词.

    注意:原行没有错的不要改.

I've really got to do something to lose weight because

I'm getting much too fat.1 wasn't worried about it until I

go                                                    1.___________

to see the doctor. He told me that I'd probably had a heart

                                                          2.___________

attack while started eating less. When you're on a diet you

                                                           3.____________

have to stop eat too much even though you are always

hungry.                                               4.___________

They may be very hard to do and you certainly need a lot

                                                           5.___________

of will-power to succeed. So I would stay on a health farm

for a                                                    6.___________

month l won't be able to eat much and so I'll have to stick

                                                             7.___________

to my diet. I'll also do plenty of exercise, which won't give

                                                             8.___________

me any harm too. Both the diet and the exercise will

                                                              9.__________

help me to lose weight and feel more better. 

                                                              10.___________

题型:选择题
阅读下面这首宋诗,完成后面的题目。

陈与义
潇潇十日雨,稳送祝融归。燕子经年梦,梧桐昨暮非。
一凉恩到骨,四壁事多违。衰衮繁华地,西风吹客衣。
  【注】①陈与义(1090-1138):字去非,号简斋,洛阳人。这首诗作于政和八年(1118),当时作者正闲居京城等候授职。②祝融:火神,这里指夏季。③四壁:家徒四壁,指穷困。④衮衮:众多,这里指众多居高位而无所作为的官吏。繁华地:指京城。  
 (1)第二联两句诗是什么意思?表达了作者什么样的感情?   
答:_______________________________________________。
(2)前人认为这首诗写雨时妙在“若即若离”,你同意这种说法吗?请简述理由。     
答:_______________________________________________。
题型:选择题

等于().

A.xyexy

B.x2exy

C.exy

D.(1+xy)exy

题型:选择题

如果一国国际收支顺差,意味着该国商业银行和中央银行的外汇储备()。

A.减少

B.不变

C.增加

D.不能确定

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