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. When I arrived to obtain it back again the subsequent early morning, I couldn't recommend them off my arrival this time inside the app. But I parked ideal in front on the large sidewalk yet again, went in & waited maybe 2 ... https://newluxurypropertyingurgaon.blogspot.com/