一个长方体玻璃缸,从里面量长60厘米,宽40厘米,缸内水深16厘米。把一块石头浸入水中后,水面升到19厘米,求石块的体积。
Hong Kong is in the ____ (south) part of China.
巴西所属的大洲是( )
—Study hard and keep doing exercise. Your dream will come true.
若常温下的超导体研制成功,则它将适合于做( )