—________________, but my sister likes them.
A:I like them
B:I love it
C:I can't stand them
D:They're interesting
一个几何体的三视图如图所示,则这个几何体的表面积等于( )
晓峰想了解本班同学的近视发病率.现有两种方案:
①抽样调查法,任抽班上3组同学进行调查;
②普查法,对全年班同学进行调查.