推进从事公益服务事业单位改革,改革管理体制的核心要求是()
A、转变政府职能
B、探索管办分离
C、取消行政级别
D、创新机构编制管理
参考答案:A, B, C, D
单词拼写。
1. The news quite ______ (使心烦意乱) him.
2. She devoted herself ______ (完全地) to her research.
3. He wore a long and ______ (宽松的) coat.
4. It is beyond my p ______ to help you.
5. She c ______ in the exam by looking at my paper yesterday.
6. Let's have some sports o______ instead of staying indoors on such a fine day.
如图所示截面为矩形的平行玻璃砖,图中的MN垂直NP,一束单色光从MN上的一点进入玻璃砖后,又从NP上一点B返回空气中,已知入射角α和出射角β。
(1)求玻璃砖的折射率。
(2)若已知n=,0≤α≤π/2,求β的最小值。