棱锥的一个面在W面的投影积聚成一条线,面上的一点A在W面的投影也在这条线上。
查看答案
I, who ______ your close friend, will try my best to help you out of trouble. (be)
There _____ a lot of rubbish on the floor so I asked Mary to sweep it up. (be)
What the children in the mountain village need ________ good books.(be)
_________some bananas and an orange in the basket.(There be)