V2火箭并非普通武器:它只能用于对付城市。原子弹也是这样。The V2 was not an ordinary weapon: it could only be used against cities. Likewise the atom bomb.一颗原子弹能摧毁一座城市。An atom bomb would destroy a city.只有总统才能授权使用原子弹。Only the President could authorize...
For use with backflow preventer test cocks to protect from damage.用于防回流阀测试旋塞,防止受到破坏.Backflow preventer manufactured from 300 Series stainless steel for corrosion resistance.防回流阀采用耐腐蚀的300系列不锈钢制造.However, backflow may now ...