汽油是混合物,我们可以把它近似看作C8H16,汽油密度约为0.7kg/L. (1

题型:计算题

问题:

汽油是混合物,我们可以把它近似看作C8H16,汽油密度约为0.7kg/L.

(1)C8H16的相对分子质量为            

(2)汽油中碳元素的质量分数约为                    (计算结果保留至0.1%);

(3)请依据化学方程式计算:一辆百公里油耗为10L的汽车每公里排放CO2多少克?(假设汽油燃烧充分)

考点:化学反应方程式的计算相对分子质量物质组成元素的质量分数
题型:计算题

直肠结肠息肉癌变率最高的类型是()

A.儿童性息肉

B.炎性息肉

C.增生性息肉

D.绒毛性息肉

E.淋巴样息肉

题型:计算题

  下面一段文字,句式灵活,富于变化。但加横线的一句话,在连贯性上较差,请作改动,使之语气更连贯。

  孩子需要爱,需要长辈的爱,也需要同龄人的友爱,但他们不需要溺爱。许多时代的废人、社会的累赘都是过分溺爱的结果。因此,我们呼吁:不要让孩子在溺爱中成长。

改句:___________________________________________________

题型:计算题

阅读理解

     In a cold winter, a couple had to move out from the luxury villa because of bankruptcy. The husband

worked day and night to support the family but with no care of his wife. So she thought, "he doesn't love

me anymore, he just cares his business...not me".

     One day, she began to take a bath, he stopped her at the door, "Let me take it first, OK?" "Why not

let me shower first," she asked. "I was tired, sweetie, you take it later, OK?" She was totally depressed.

     On a morose day, she found nothing to do and turned on his computer, a few words blurred her

eyes...it was his diary:

     Today, I was quite sad, she asked me why I was always taking the bath first, and I said to her, I was

exhausted. She was unhappy, in her mind, I treated her not as well as usual, but how can I do? I wasn't

as rich as before! We moved to the small apartment, there was only a shower in such a freezing winter.

But I found that if one person took the shower first, the room could get a litter warm, so every time I

rushed to the bathroom first. I was thinking that, when she took the shower, the room would get warmer,

at least1℃,2℃or 3℃

     Now I can't give her comfortable life, bring her the luxury restaurant, buy expensive dresses for her,

but at least, I can give her 1℃love.

1. Why was the husband always taking the bath first?

A. Because he was tired from work.

B. Because he didn't love her anymore.

C. Because he wanted to get the bathroom warmer.

D. Because he treated his wife not as well as usual.

2. What does the underlined word "bankruptcy" in the first paragraph probably mean?

A. crash

B. moving

C. diseases

D. failure

3. The best title of the passage may be ______.

A. A trouble

B. 1℃love

C. Husband and wife

D. A romantic love story

题型:计算题

某患者骨髓显像结果提示中央骨髓受抑、外周骨髓扩张

如果该患者随着病程的延续,活性局灶出现率增大,则提示

A.病情恶化
B.可能为新发病灶,需要进行骨髓穿刺
C.常规治疗效果及预后较好
D.可以结束治疗
E.以上均不是

题型:计算题

酒渣鼻多发于()

A.10~20岁

B.30~50岁

C.10~40岁

D.20~30岁

E.50~60岁

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