亚硝酸钠(NaNO2)的外观与食盐很相似,有咸味,误食易中毒.区别它们的一种方法

题型:选择题

问题:

亚硝酸钠(NaNO2)的外观与食盐很相似,有咸味,误食易中毒.区别它们的一种方法是:将两者分别加热到320℃,不分解的是食盐,能分解并放出一种具有刺激性气味气体的是亚硝酸钠.该气体可能是(  )

A.NH3

B.SO2

C.NO2

D.N2

考点:质量守恒定律
题型:选择题

阅读理解。

     After twenty years of shaving himself every morning, a man in a small Southern town thought he had

enough. He told his wife that he wanted to let the barber shave him every day. He put on his hat and coat

and went to the barber shop.

    The barber's wife Grace was working that day, so she performed the task. Grace shaved him and said,

"That will be $20." The man was surprised, but he paid the bill and went to work.

    The next morning, the man looked in the mirror and his face was as smooth as it had been when he left

the barber shop the day before. "Not bad," he thought. "At least I don't need to get a shave every day."

    The next morning, the man's face was still smooth! Two weeks later, the man was still unable to find

any trace of whiskers on his face. It was more than he could take and he was frightened, so he returned

to the barber shop.

     "I thought $20 was too high for a shave, but now I think $20 is too little," he told the barber's wife.

"You must have done a good job. It's been two weeks and my whiskers still haven't started growing back."

The expression on her face didn't even change, and she said, "You were shaved by Grace. Once shaved,

always shaved."

1. It is implied in the first sentence of the passage that ______. [ ]

A. the man lived a very poor life

B. the man liked shaving himself

C. the man finally got bored of shaving himself

D. the man decided not to shave again

2. We learn that at first the man thought $20 for a shave was ______. [ ]

A. too little

B. too much

C. proper

D. impossible

3. What can we learn from the passage? [ ]

A. Everybody in the town knows Grace.

B. Nobody wants to be shaved by Grace in the town.

C. The man's whiskers grew back at last.

D. The man was scared by the resulted two weeks later.

题型:选择题

办公空间和教学空间属于空间组合方式中的( )组合。

A.集中式组合

B.线形组合

C.辐射式组合

D.组团式组合

题型:选择题

斯密关于价值意义的论述是什么?价值与交换价值的关系的论述是什么?

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否定之否定是普遍存在的事物周期性发展过程。否定之否定的整个进程,是一个“循环往复”、“原地踏步”的过程。

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秦始皇、李斯法律思想的主要内容有哪些?

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