一个四棱锥和一个三棱锥恰好可以拼接成一个三棱柱.这个四棱锥的底面为正方形,且底面边长与各侧棱长相等,这个三棱锥的底面边长与各侧棱长也都相等.设四棱锥、三棱锥、三棱柱的高分别为,,,则( )
In Britain today, women 44% of the workforce and nearly half the mothers with children are in paid work.
How can he without money for food during the journey?
You will never all your homework tonight if you don’t fix your attention on it.
We must the train being late it always is.
--- Have you drawn up that list of names yet? --- No, but I’m going to it.