良好的保管意味着消灭火灾的“隐患”。
A motor enclosure which protects against falling liquids is classified as （） ["waterproof","drip proof","spray tight","spray proof"]
To determine what navigation lights and day-shapes must be displayed on mobile offshore drilling units under tow，you should check the（）. ["American Bureau of Shipping classification rules","International Regulations for Preventing Collisions at Sea","Safety of Life at Sea Convention","Minerals Management Service rule"]
消防队中最重要的是灭火机组。
Universal motors will operate on AC or DC current, and are generally found in （） ["portable tools","large pump motors","turbo electric main motors","forced draft fa"]
怎样运用反光板摄影？
