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What is the authors advice to

A. They treat the dollar with a little respect.
B. They try to win in the weak-dollar gamble.
C. They vacation at home rather than abroad.
D. They treasure their marriages all the more.

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毛细管柱色谱仪的结构特点是什么？如何解决毛细管柱内径细所带来的问题？

A.Working in an emergency room.B.Watching horror movies.C.Listening to r

A. Working in an emergency room.
B. Watching horror movies.
C. Listening to rock music
Doing daily routines.

有甲、乙两根长度相同的色谱柱，测得它们在范第姆特方程式中的各项常数如下：甲柱：A=0.07cm，B=0.12cm²·s^-1，C=0.02s；乙柱：A=0.11cm，B=0.10cm²·s^-1，C=0.05s。求：

在一个3m长的色谱柱上，分离一个样品结果为t₀=1min，t_R1=14min，t_R2=17min，Y₂=1min。计算：