下列各组稀溶液中,利用组内物质的相互反应,不用其它试剂就可以鉴别出来的是 A.N

题型:选择题

问题:

下列各组稀溶液中,利用组内物质的相互反应,不用其它试剂就可以鉴别出来的是

A.NH4NO3、KOH、NaCl、Fe2(SO4)3

B.K2CO3、Ba(NO3)2、HCl、Na2SO4

C.CuSO4、H2SO4、NaOH、HNO3

D.Na2SO4、MgCl2、KNO3、NaOH

考点:水(蒸气)的检验粗盐的提纯空气的检验物质的相互转化和制备
题型:选择题

属于酌量性固定成本的有()。

A.机器设备折旧费

B.长期租赁费

C.广告费

D.职工最低工资

题型:选择题

阅读理解

Hello Sandy, 

    We have just returned from our holiday.We went with our friends Edward Smith and hiswife Tina

to the Yorkshire Moors. This is abeautiful place. It is a natural park. There arelots of places to walk

on the tops of the hills,miles of grassland with no people, just sheepand birds.

    Edward, who had just come out ofhospital, could not walk as far as he used to.However this meant

that we walked in themornings, and then stopped at a cafe for luncheach day, before returning to the

place welived. Edward and I slept in front of the fire allafternoon, while the ladies went for anotherwalk.

Very pleasant !

    I have taken lots of photos from the placewe lived, across the valley (峡谷) below us.  ofthe morning

sunrise, and the mist in the valley.Also, in England, the old steam-powered trains(蒸汽火车)are very

popular. I have taken manyphotos of the train and from it.

    Yesterday we had the first snow of this,winter. It was very early (we usually expectsnow in January).

It rained all day, thensnowed in the evening. Today we have brightsunshine !

    Both Jenny and I are well. I don't know if Itold you, in the last e-mail, that Jenny is nowworking in a

hotel. Although she has to workhard, people there are nice and she is enjoyingthe work.

    Please write to tell us your news.

                                                                                                                        Yours, 

                                                                                                                        Victor

1. What kind of place is the Yorkshire Moors?

A. A hotel.

B. A natural park.

C. A hospital.

D. A cafe

2. When did the ladies take a walk?

A. Only in the morning.

B. Only in the afternoon.

C. Both in the morning and in the afternoon.

D. In the evening.

3. They had          snow this winter.

A. an early

B. a late

C. a usual

D. a big

4. What does the underlined word "it" in Paragraph 3 mean?

A. The valley.

B. Travel.

C. The mist.

D. The train.

5. What do we know from this passage?

A. This is the first time Victor has written an  e-mail to Sandy.

B. Edward didn't go traveling because he had  just come out of hospital.

C. Jenny's new job in a hotel is an easy one.

D. People in England like the old steam-powered  trains very much.

题型:选择题

不宜实施腹腔镜手术的病人是().

A.既往曾行剖腹产手术,现准备行胆囊切除术

B.年龄60岁以上病人

C.凝血功能障碍未纠正者

D.糖尿病病人

E.特发性血小板减少性紫癜准备行脾切除术的病人

题型:选择题
大量汽车尾气也会引起酸雨.下列汽车尾气中能引起酸雨的是(   )

A.N2

B.CO

C.NO2

D.CO2

题型:选择题

正常脑脊液中糖的最低含量为2.5mmol/L。

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