代数式2x-1的意义是( ) A.x与1的差的两倍 B.x与1的两倍的差 C.比

题型:选择题

问题:

代数式2x-1的意义是(  )

A.x与1的差的两倍

B.x与1的两倍的差

C.比x的两倍小1的数

D.比x的两倍大1的数

考点:代数式的概念
题型:选择题

短文改错。

     文中共有10处语言错误,每句中最多有两处。错误涉及一个单词的增加、删除或修改。

     增加:在缺词处加一个漏字符号(∧),并在其下面写出该加的词。

     删除:把多余的词有斜线划掉。

     修改:在错的词下划一横线,并在其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 our six children were young, suppertime is always being interrupted by neighborhood children ring

the bell. They wanted one child or another to come out and played. Finally we had good idea.We hung a sign

on the front door that read:"We are having dinner. Come later."That night, we sat down to what they thought

it would be a pleasant, uninterrupted meal. And as soon as we began dinner, the doorbell rang. At the front

door stood an eight-years-old boy. He looked up to us, saying,"I just want to know how the sign says".

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下列除哪项外均易造成低钾血症()

A.呼吸性碱中毒

B.周期性瘫痪

C.肾小管性酸中毒

D.大量溶血

E.注射"葡萄糖和胰岛素"

题型:选择题

协作图和顺序图都是用于描述模型系统中对象之间的交互行为,请简述它们各自的特点。

题型:选择题

自动喷水灭火系统根据适用范围不同,可分为以下七类()、干式系统、干湿式系统、预作用系统、雨淋系统、水喷雾系统、水幕系统。

题型:选择题

什么是南拳?

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