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【单选题】
xt0506621在气相色谱定性分析中,在样品中加入某纯化物质使其中某待测组分的色谱峰增高来定性的方法属于()A.
利用化学反应定性
B.
利用保留至定性
C.
利用检测器的选择定性
D.
与其他仪器结合定性
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【单选题】Why did the girl want to make money?
A.
She wanted to buy a new bike.
B.
She wanted to go traveling.
C.
She wanted to have a dog.
【单选题】Why did Carolyn set up her own consultancy?
A.
She wanted to work independently
B.
She wanted to work on a greater variety of projects.
C.
She felt she could do better than the company she worked for
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【简答题】说明中间继电器的作用。
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【单选题】- You were _____ about Jane. She really wanted to help you. - Sorry, I thought she wanted to laugh at me as usual. [ ]
A.
mistaken
B.
thankful
C.
wrong
D.
straightforward
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