9899○9799，○里填（  ）

计算：（ $\sqrt{3}$ + $\sqrt{\text{2}}$ ） $\sqrt{\text{2}}$ +（2 $\sqrt{3}$ +3 $\sqrt{\text{2}}$ ）×（2 $\sqrt{3}$ ﹣3 $\sqrt{\text{2}}$ ）

如图，在六边形ABCDEF中，∠A=∠B=∠C=∠D=∠E=∠F，且AB+BC=22，试求DE+EF的值．

用N_A表示阿伏伽德罗常数，下列有关说法正确的是（　　）

阅读短文，下列问题
A
    One night there was a heavy snowstorm(暴风雪), and in the morning Mr. Smith's garden was full of snow. Mr. Smith wanted to take his car out, so he asked a man to clean the road from his garage to his gate, he said to the man,"Don't throw any snow on that side, because it will damage (破坏) the shrubs in my garden and don't throw any on the other side, because it will break my fence; and don't throw any into the street, or the police will not be pleased. "Then Mr. Smith went out.
    When he came back, the road was clean and there was no snow on the shrubs, or the street. Mr. Smith was pleased until he opened the garage to get his car out. There was full of snow from the road, and his car was somewhere under it all.