双阀型

dual valve type的用法和样例：

例句

Double Check Valve Assemblies shall consist of two positive seating check valves located between two resilient seated shutoffs with four ball valve type test cocks.这种双止回阀总成应该由两个正向密封止回阀，夹在两个弹性阀座关闭阀之间，并配置四个球阀型测试旋塞构成。

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