Effective as preventers of further infection.

作为进一步感染的防止药物是有效的。

Especially made for testing all reduced pressure zone backflow preventers.

专用于检测所有减压区防回流阀.

This valve is used on diverter systems and choke lines leading from the blow out preventers.

此阀用于分流系统和从防喷器引出的阻流管线上。

Therefore, all backflow preventers have to be tested periodically to ensure that they are functioning properly.

因此，所有防回流阀必须定期检测，以确保功能正常。

The following Test Procedure is one of several that is recognized throughout the United States for testing Backflow Preventers.

下列检测程序是美国检测防回流阀通用的几种检测程序中的一种。

Watts Dual Check Backflow Preventers can be specified in many different combinations of connection types, sizes, and union options.

美国瓦茨双止回防回流阀可以按照连接类型、通径和接头构成许多不同的组合。

Like all wells, Shell will use blowoutpreventers. Unlike BP's Shell's blowout preventers will lie beneath the seabed,so a rig can disconnect more safely in case of emergency.

与所有的油井一样，壳牌将会使用防喷器。与英国石油公司(BP)不同，壳牌的防喷器将置于海床之下，这样，在紧急情况下，钻机可以更安全地断开连接。

As a part of what happened in the postDeepwater Horizon world, all these blowout preventers were actually broughtback to what we call original equipment manufacturer standards.

作为出现在之前的深海地平线事件中的部分，实际上，所有带回的这些防喷器实际上就是我们所说的原始设备制造商的标准。