X线最强波长与最短波长的关系是A．λmax＝0.5λ0 B．λmax＝1.5λ0 C

已知热化学方程式：SO₂(g)+ 1/2O₂(g) SO₃(g) △H = -98．32kJ／mol，在容器中充入2molSO₂ 和1molO₂充分反应，最终放出的热量为 [ ]

A．196．64kJ

B．196．64kJ／mol

C．＜196．64kJ

D．＞196．64kJ

用所给词的适当形式填空。

1.This is a _____ (person) question.I won't answer it.

2. I want some _____ (suggest) about what to do next.

3. Peter just _____ (receive) a nice present.

4. I didn't know who _____ (give) her that album.

5. These _____ (guy) are very clever. They can work it out quickly.

6. How about _____ (drink) a cup of coffee?

7. Why not _____ (get) up a little earlier?

8. I don't think the movie is _____ (interest).

9. Tom got a soccer ball on his _____ (seven) birthday.

10. What  a _____ (luck) guy!

某1g含有杂质的氢氧化钠样品溶于水能与5g质量分数为14.6% 的盐酸恰好完全反应，计算该样品中氢氧化钠的质量分数。( 杂质不与盐酸反应)

主要手术编码的正确率必须达到（）。

A.85%

B.90%

C.95%

D.99%

E.100%