Standard specification for doors , double , gastight airtight , individually dogged , for marine use 船用耐气密造不透气双层单独安夹扣的门标准规范
Butterfly valves can operate for more than 10 , 000 cycles and still provide " bubble tight " shut off 蝶阀在使用10 , 000次以上，仍然能够保证关闭时"不透气" 。
Standard specification for doors , watertight , gastight airtight and weathertight , individually dogged , for marine use 船用水密,气密不透气和不透风各扇单独安夹扣的门
Standard specification for door fittings , for watertight gastight airtight , weathertight , and non - tight doors , for marine use 船用水密,气密不透气和防风雨及无夹扣门的门配件
They have the characteristics of strong intensity , light material , airtight , anticorrosion , aging resistance , low cost , etc 具有强度好、质轻、不透气、耐腐蚀、抗老化、价格低等特点。
So , it is of great importance to choose suitable sanitary napkin if you want to spend a good time in period 这多是由于使用不透气的卫生巾造成的，因此，要安度经期，选择合适的卫生巾至关重要。
Gate and globe ( metal to metal ) seats cannot provide bubble tight shut - off . resilient seated butterfly valves are bubble tight by design 闸阀和截止阀（金属与金属连接）的阀座不具备不透气关闭的性能。
The material is impermeable to air and fluids and can withstand at least eight hours of exposure to corrosive chlorine and ammonia gas 这种材料不透气亦不渗水，且暴露于具腐蚀性的氯气与氨气下时，至少能耐得住八小时。
