【单选题】【消耗次数：1】
下列哪种方法是以物质对光的吸收为基础建立起来的方法
①
比浊法
②
质谱法
③
X射线衍射法
④
红外光谱法
参考答案：
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相关题目
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红外光谱法中的红外吸收带的波长位置与吸收谱带的强度, 可以用来
①
鉴定未知物的结构组成或确定其化学基团及进行定量分析与纯度鉴定
②
确定配位数
③
研究化学位移
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研究溶剂效应
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中国最早的国家是在4000年前的_____ 朝建立起来的。
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I’d almost given up hope of finding a house I liked, and then suddenly this one __________ .
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turned over
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turned up
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turned on
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turned down
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He __________ to arrange a loan through a finance company.
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tried
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succeeded
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managed
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endeavored
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The concert usually takes place at the People’s Square, with the audience __________on the groun@@
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seating
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seated
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be seating
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to seat
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Big changes have taken place at Marketing Department the new manager came.
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before
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after
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since
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The government official explained that there’s no point ___________ about the cultural gap in that city.
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to worry
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with them worrying
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in worrying
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_________ such a good chance he planned to learn more.
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giving
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Having given
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The room has no furniture -----a broken chair.
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beside
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except for
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expect
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except that
【单选题】
Hello, may I talk to the headmaster now?
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Sorry, he is busy at the moment
②
No, you can’t
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Sorry, you can’t
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I don’t know
【单选题】
Can you turn down the radio, please?
①
Oh, I know
②
I’m sorry, I didn’t realize it was that loud
③
I’ll keep it down next time
④
Please forgive me