国产黄色精品无码一区二区_久久久久青草线综合超碰_人人澡人人爽人妻斩_黄片毛片在线观看亚洲人成电影院,亚洲第九十九页,天天操婷婷,天天操狠狠操夜夜操,www操操操,一级成人a

In modern medical, how to collect blood become more and more improvement, which from the single collection become to vacutainer collection, now with the use in clinic the vacuum tube blood collection become the main.

At the clinic use, main for blood test and kinds of blood cell culture. In the finished tubes there are EDTA and other medical to prevent blood on wall of tube, and the EDTA can stop blood congeal.

With this kind blood collection device use in clinic which help a lot in cell study, include the blood cell test and analyze, when collect the blood in this kind tube, it can keep blood in activity for long time.

Also the medical add into vacuum tube can keep long time of the effective of the medicine, when blood into the tube can reacted fast and sufficient.