This article details the inportance of the valve in the project, flow pipe system and installation technique.
主要从工程应用、供水管路系统、安装工艺等方面，详细介绍了阀门在供水管道中的重要性。
His incisive, domineering utterance and imposing style, with his strong aquiline nose and resolute clean-shaven mouth, give him an air of inportance.
他说话的口吻决绝、专横，态度盛气凌人，再加上他的鹰钩鼻，刮得光光的绷紧着的嘴，使他大有不可一世的气概。 收藏。
His incisive, domineering utterance and imposing style, with his strong aquiline nose and resolute clean-shaven mouth, give him an air of inportance.
他说话的口吻决绝、专横，态度盛气凌人，再加上他的鹰钩鼻，刮得光光的绷紧着的嘴，使他大有不可一世的气概。 收藏。
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