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                  在我【们的日常生活中,总○是有着各种各样的阀门。阀门↓经常出现在我们的生活里。

                • 简述平板闸阀的优缺点和选用原则

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                  平板闸阀是一种关闭件为平行闸板的滑动阀。其关闭件可以是单闸板或是其间带有撑开机构的双闸板①。闸板向阀座的压紧力是由作用于浮......

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