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. Requested the wrong sizing Television set from the app, but was ready to promptly transform my obtain from the application also when I found out my miscalculation a couple of hours later on. My very own exploration for the... https://diigo.com/0zxaly