硫化氢()的说法是不正确的。A、无毒且有臭鸡蛋气味 B、是可燃性气体 C、具有还原性

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问题:

硫化氢()的说法是不正确的。

A、无毒且有臭鸡蛋气味

B、是可燃性气体

C、具有还原性

D、比空气略重

考点:硫磺回收装置操作工考试硫磺回收装置操作工(初级)硫磺回收装置操作工(初级)题库
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请用方框中所给词的适当形式完成这篇短文,并把所缺单词填写在答题卡指定的位置上。
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I am a student in Grade Three. I began to learn English the year before last year. English isn’t very小题1:        to learn. But I like it very much.
小题2:        do I study English?
In the first year, I found小题3:         very difficult to memorize new words. At first I小题4:        a lot of time on them. I learned new words only小题5:         reading
and writing them.小题6:        a few days later I forgot them. Later, with小题7:        help of my teachers, I came to know how to do it well. I paid more attention to小题8:        and spelling. In this way, I have小题9:        a lot of new words by heart. Every morning after I get up, I do some reading. At school I小题10:       to speak English with my classmates and review what I have learned.
Nothing is too hard if you put your heart into it.
题型:单项选择题

下列哪种气体不能用于超声造影

A.空气

B.二氧化碳气体

C.氧气

D.纯氮气体

E.氟碳气体

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室内设计的主体是实体设计还是空间设计?

题型:单项选择题

放射线的间接作用是放射线与下列哪种物质作用引起的()

A.蛋白质

B.水分子

C.RNA

D.DNA

E.脂肪

题型:单项选择题

简述“U”形管原理。

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