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. On Sunday, the castle’s proprietor John Gordon, 76, was forced to maneuver out his property following the River Dee swept away about 60 toes of land, leaving the castle dangerously near the river, based on the Scottish Eve... https://propertiessalegurgaon.blogspot.com/