【单选题】— What did you see at that time? — When the ship was on ____ point of sinking, people on ____ board rushed to the bank like ____ crazy.
【单选题】普通货船在海上空载航行时,为了保证螺旋桨和舵有一定的入水深度,螺旋桨轴至水面的高度I与螺旋桨的直径D之比应_______。 (40604:第三章_吃水差:1055)
【判断题】都江堰和秦始皇陵哪个的修建年代更早?(A) A、都江堰 B、秦始皇陵