We were late for the film Roman Holiday, but ____ (luck) we didn't miss much.
一个几何体的三视图如图所示,则该几何体的表面积( )
若x1,x2(x1<x2)是方程(x-a)(x-b)=1(a<b)的两个根,则实数x1,x2,a,b的大小关系为( )
在“观察水的沸腾”实验中:
下列位于北冰洋沿岸的重要港口是( )