twin check的意思|示意

NOTE: Twin Disc Check Valves can be installed horizontally or in the vertical position with flow up.

注意：双阀瓣止回阀能够安装在水平或流向朝上的垂直位置。

Clerk: Oh, just a minute please, Mrs. Jones. Let me check it for you. Yes, we have your reservation. A single with shower and a double with twin beds for three days, Is that right?

噢，请等一下琼斯夫人．让我替你查一下．是的，我们有你的预约，一间有淋浴和成对单人床的房间， 时间是三天，对吗？

This paper introduces the observation, records, calculation and data check of twin turning point method, its advantages, disadvantages, points for attention are discussed.

在困难地区进行支水准路线测量时，可以采用双转点法。