A:垂直于弦的直线必经过圆心
B:平分弦的直径垂直于弦
C:平分弧的直径平分弧所对的弦
D:同一平面内,三点确定一个圆
— Let's read the report on India's population in the newspaper.
— Wow! ____________ large population!
如图所示的电路,闭合开关S1和S2后,下列分析正确的是()