题目内容

已知在混合酚样品中仅含有苯酚、o-甲酚、m-甲酚、p-甲酚四种组分，经乙酰化处理后，测得色谱图，从图上测得各组分的峰高、半峰宽以及测得相对校正因子分别如下：
求各组分的质量分数。

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A.To combat competition and raise productivity.B.To provide them with more job op

A. To combat competition and raise productivity.
B. To provide them with more job opportunities.
C. To help them maintain their living standard.
D. To prevent them from holding a second job.

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Conversation One．听材料，回答下列问题：

A. How to spend summer holiday.
B. How to avoid seasickness.
C. How to prepare for a boat trip.
D. How to deal with vomiting on a sea trip.

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有一A，B，C三组分的混合物，经色谱分离后，其保留时间分别为：t_R(A)=4.5min，t_R(B)=7.5min，t_R(C)=10.4min，死时间t₀=1.4min，求：

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According to Galbraith, people feel discontented because ________。

A. public spending hasnt been cut down as expected
B. the government has proved to be a necessary evil
C. they are in fear of another Great Depression
D. materialism has run wild in modem society

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已知在混合酚样品中仅含有苯酚、o-甲酚、m-甲酚、p-甲酚四种组分，经乙酰化处理后，测得色谱图，从图上测得各组分的峰高、半峰宽以及测得相对校正因子分别如下：求各组分的质量分数。

A.To combat competition and raise productivity.B.To provide them with more job op

Conversation One． 听材料，回答下列问题：

有一A，B，C三组分的混合物，经色谱分离后，其保留时间分别为：tR(A)=4.5min，tR(B)=7.5min，tR(C)=10.4min，死时间t0=1.4min，求：

According to Galbraith, people feel discontented because ________。

已知在混合酚样品中仅含有苯酚、o-甲酚、m-甲酚、p-甲酚四种组分，经乙酰化处理后，测得色谱图，从图上测得各组分的峰高、半峰宽以及测得相对校正因子分别如下：
求各组分的质量分数。

Conversation One．听材料，回答下列问题：

有一A，B，C三组分的混合物，经色谱分离后，其保留时间分别为：t_R(A)=4.5min，t_R(B)=7.5min，t_R(C)=10.4min，死时间t₀=1.4min，求：