sanitary protection zone的意思|示意

卫生防护区 ... 卫生工程：sanitary engineering 卫生防护区：sanitary protection zone 卫生彩色瓷器：china sanitary ware ...

卫生防护带 · =single-pole single-throw 单刀单掷(开关) · =Sanitary Protection Zone 卫生防护区 卫生防护带 · =Safety Recommendation 保安建议 ..

卫生保护区 卫生保护区 sanitary protection zone 食品卫生标准 food hygienic standard; standard of food hygiene; standard of food sanitation ..