标准：美标阀门、国标阀门广泛用于水电力、石化、环保、医药等行业。
Standard: American standard valve, the valve is widely used in the gb water power, petrochemical, environmental protection, medicine industry etc.
标准：美标阀门、国标阀门广泛用于水电力、石化、环保、医药等行业。
Standard: American standard valve, the valve is widely used in the gb water power, petrochemical, environmental protection, medicine industry etc.
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