Specimen可与sample换用，但常指人或物中选出的有代表性部分，或指供科研、化验或检验用的标本。 主要内容如下:分 析介绍了几种常见抽油泵的工作原理、构造 、 适用范围及分类. After i arrived to get it back the next early morning, I could not suggest them off my arrival this time from the application. But I parked right in front on the big sidewalk once again, went in & waited it's possible two ... https://diigo.com/0zxaly