Gasoline vapor tends to collect（）. ["above the floor plates of the bilges","above the carburetor level","at the lowest point of the bilge areas","at no particular level"]
南北美洲和拉丁美洲是怎样划分的？
在下列情形中，专利权不因此而终止的是（）。 ["被强制许可","没有按规定缴纳年费","专利权期限届满","专利权人书面声明放弃专利权"]
If the overflow tank high-level alarm sounds while the fuel oil tanks are being topped off, the engineer should （）. ["close the static leg filling valve","close the overflow tank falling valve","reduce the fuel oil pumping rate","stop the fuel oil pumping operatio"]
在Windows 2000“资源管理器”窗口中，若文件夹图标前无任何符号，则表示该文件夹（）。 ["包含下一级文件夹，已展开","包含下一级文件夹，尚未展开","不包含下一级文件夹","无任何意义"]
南非经济发展的情况如何？
