问题 单项选择题

温度均一性较好的PCR仪为()

A.水浴锅PCR基因扩增仪和压缩机PCR基因扩增仪

B.半导体PCR基因扩增仪和离心式空气加热PCR基因扩增仪

C.压缩机PCR基因扩增仪和半导体PCR基因扩增仪

D.压缩机PCR基因扩增仪和离心式空气加热PCR基因扩增仪

E.水浴锅PCR基因扩增仪和离心式空气加热PCR基因扩增仪

答案

参考答案:E

单项选择题
完形填空

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You'll automatically be  50  the right heart-healthy track if vegetables, fruits and whole grains make 51  three quarters of the food on your dinner plate. 52  in the remaining one quarter with lean meat or chicken, fish or eggs.

The foods you choose to eat as well as those you choose to  53  clearly contribute to your well-being. Without a  54 , each of the small decisions you make in this can make a big 55  on your health in the years to come.

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