方程(x-3)(x+1)=x-3的解是______.

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问题:

方程(x-3)(x+1)=x-3的解是______.

考点:一元二次方程的解法
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____ is this dress?[ ]

A. How old    

B. How many    

C. How much  

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完成句子。

A: Good morning, Bob.

B: Good __1__ Miss Smith. How are you?

A: Very well, __2__ . And you?

B: __3__  fine, thank you.

A: What's that young man's__4__ .

B: __5__  name is Dick Johnson.

A: What is he?

B: He's __6__  English teacher.

A: __7__  __8__ is he?

B: He is twenty-one years old.

A: __9__  was he born?

B: He was born __10__  Hefei.

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硅沉着病(矽肺)的特征性病理改变是()

A.矽结节

B.肺间质纤维化

C.圆形小阴影

D.肺泡结构破坏

E.肺脏体积增大、含气量减少

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一般电气设备着火,必须使用()灭火。

A.水;

B.泡沫灭火器;

C.二氧化碳;

题型:填空题

数字签名属于消息认证方式。

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