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。

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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。

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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？

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Jack Parker, their former coach and a twin himself, said sometimes he had to check Mike's right ear to tell the twins apart because Mike had a freckle there that Mark didn't have.

CNN: Brother of 9/11 victim speaks out after five years

As the author of "Your Evil Twin: Behind the Identity Theft Epidemic, " Sullivan shreds check statements and never answers e-mail solicitations.

NPR: Identification Theft: Protecting Your Personal Data