下列有关光的现象中，正确的说法是( )
A：阳光下，微风吹拂的河面，波光粼粼，这里蕴含着光的反射现象
B：汽车在夜间行驶时，应打开驾驶室里的电灯
C：人在照镜子时，总是靠近镜子去看，其原因是靠近时，平面镜所成的像会变大
D：在暗室里，为了能从镜子中看清自己的脸部，应把手电筒正对镜子照射
Every school has its own rules. How many1are there in your school？ At some schools, the students 2 to wear uniforms on school days. But many students don't like to wear uniforms. They think the uniforms are the ugliest 3 in the world. But the school don't allow students to wear 4 own clothes at school. So some students draw cartoons or some famous singers on their 5. They think it is very6that everyone wears the same. It is very unfair(不公平的） that teachers and students are wearing7. But most of the students 8the rules. What do you think 9 it? Do you 10your school uniforms?
根据下列实验要求，完成以下各题：
在△ABC中,A=60°,C=45°,b=2,则此三角形的最小边长为( )
2015年8月1日施行的《税收减免管理办法》规定，纳税人申请减免税的，应当在政策规定的减免税期限内提出书面申请并等待批准。如果不符合法定条件而采用欺骗手段获取减免税的，税务机关将依照税收征管法有关规定予以处理。这表明（ ）
①税收是国家财政收入最可靠的来源 ②强制性是税收的基本特征之一
③税收具有无偿性 ④纳税人既要行使权利又要履行义务
（不考虑Mg2+和Al3+的水解及水的电离所引起的离子总数的变化）
