关于电泳现象的各种阐述中正确的是（）。

正确答案：正确

参考答案：A

答案：D

答案：D

解析：

正确答案：E
免疫固定电泳实验时所需的时间为3小时左右。

答案：A

解析：

参考答案：Certificate Mania In the face of fierce competition in the job market nowadays, many university students take various training courses and sit for certificate exams to gain a competitive edge.They usually spend weekends or vacations in training camps, polishing up on their acquired skills or trying to get a new one.Certain "certificate maniacs" even aim to obtain a bunch of certificates, believing that they may come in handy someday.Several reasons may lead to this certificate mania, and the most important is that there is an increasing number of university graduates while that of job vacancies does not grow in proportion to it.Therefore, employers prefer to recruit the ones with more related experience and skills.Since exams and certificates in some way are a testimony to one's certain skills, many students tend to spare no effort to get them.Apparently, it is a good thing to be motivated to learn new things.However, "certificate mania" goes to extremes.It is not only misleading but also places a great burden on students.Some people believe that the more the better and consequently, their major studies may be neglected due to the tight schedule.In my opinion, a certificate does not necessarily reflect one's ability that really counts, so we had better keep a skeptical eye on this mania and avoid vain and burdensome efforts.