以黄铜矿（主要成分为CuFeS2，含少量杂质SiO2等）为原料进行炼铜，同时得到

在正方体ABCD-A₁B₁C₁D₁中，M，N分别是AB₁，BC₁上的点，且满足AM=BN，

有下列4个结论：①MN⊥AA₁；②MN∥AC；③MN∥平面A₁B₁C₁D₁；④MN⊥BB₁D₁D．其中正确的结论的序号是______．

腕背侧腱鞘囊肿最常见的部位在（）。

A.桡舟关节

B.舟月关节

C.舟小多角关节

D.屈肌腱鞘

E.近端指间关节

词汇运用。

1.Who is the ________(close) person in your family ?

2.I think it’ s ________( use) to talk with him ? It’s difficult to change his mind.

3.Did you have a nice time ________(ski) last week ?

4.I’ll never forget the ________(beautiful) of the old houses ?

5.Some subjects are ________(bore) . But I will try to learn them all.

6.They don’t know how ________(solve) the problem.

7.We should take the _________(follow) actions to help the wild animals.

8.He got ill yesterday. Today he feels even ________(bad) .

9.Our teachers told is that the earth ________(move)around the sun.

10.________(wolf) eat smaller animals when they are hungry

请你谈谈对法律专家意见书的认识。

GIV的襟翼有哪四个位置?

A、0/15/25/40

B、0/10/20/39

C、0/10/20/40

D、0/15/25/39