...ble Wall Bellow Swal）维修方便 (Maintenance-free)波纹管密封阀杆（spindle With Bwllow Swal）双重密封（Secondary Sealing）位置指示（Position indicator）无升降手轮（Non-rising Handwheel）用途（Selection of Possible Applications）：工业（Indust...
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The utility model relates to a bottle stopper for secondary sealing, which comprises a stopper body.
本实用新型是一种二次密封用瓶塞。
For example, in order to prevent secondary pollution, even the use of sewage is not Valve asbestos packing and gasket sealing.
例如为了防止二次污染，即使是排污阀也不采用含石棉的密封填料和垫片。
It was believed that the improvement of battery case material and the sealing technology would improve obviously the performance of AgO-Zn secondary battery.
指出壳体材料和工艺的改进将显著提高锌银二次电池的性能水平。
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