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【简答题】

Task 1. the following sentences with the words or phrases given below. competent, disappointment, perform, embark, encounter, rewarding,rewarding be resposible for, promote, combines, make an appointment, They s o many problems in their work. He should the accident. To his , he failed to pass the exam again. You need to to visit a doctor for a physical checkup. Mr. Smith is about to on a new business. The meeting discussed how to the latest product. This job is challenging but . He is very in his work. Hydrogen(氢气) with oxygen(氧气) to form water. A computer can many tasks at once.

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题目标签:氧气氢气
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参考解析:
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举一反三

【单选题】关于液氧和氧气,下列说法正确的是( )。

A.
它们的物理性质相同
B.
它们的化学性质不同
C.
它们由同种分子构成
D.
它们是不同的物质

【单选题】产生氢气的工序是()

A.
转化工序
B.
甲烷化工序
C.
变压吸附工序
D.
吸收脱碳工序

【单选题】下列有关氧气、水的说法正确的是

A.
氧气能支持燃烧,说明氧气具有可燃性
B.
硫在氧气中燃烧产生大量的白烟
C.
通过煮沸水可以降低水的硬度
D.
积极开发地下水可以保护水资源

【单选题】氢气/乙烯低时调节()。

A.
增加丁烯-1进料量
B.
增加乙烯进料量
C.
增加氢气进料量
D.
增加预聚物