（4分）A+，B2+，C-离子都由1～18号中某些元素组成。A+离子中键角为10

短文改错。

     请修改下面的短文。短文中共有10处语言错误，每处错误仅涉及一个单词的增加、删除或修改。

增加：在缺词处加一个漏词符号（^），并在此符号下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：

1. 每处错误及其修改均仅限一词。

2. 只允许修改10处，多者（从第11处起）不计分。

     When I was in high school, most of my friend had bicycles. I hoped I could also have it.

     One day I saw a second-hand bicycle, that was only one hundred yuan. I ask my father the

money. But he said he could only give me half of the money. He should find the other half myself.

     So I went to sell newspapers after the school. My father was pleased if I showed him the money

a month late. He gives me the other fifty. You can imagine how much happy I was when I rode to

school on my own bicycle.

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对重要空白凭证应怎样进行管理

下述疾病中哪一种不会引起尿流中断（）

A.膀胱结石

B.膀胱憩室

C.膀胱肿瘤

D.膀胱异物

E.输尿管囊肿

粗粒化（聚结）除油装置的聚结床工作周期结束后的清洗采用（）联合冲洗。

A.油水

B.汽水

C.气水

D.油气

我国有关司法解释规定，承包人为建设工程垫资的，如果当事人对垫资没有约定，按照工程欠款处理；当事人对垫资利息没有约定，承包人无权请求支付利息。