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12个月前
如图,边长为2的等边△ABC内接于⊙O,△ABC绕圆心O顺时针旋转得到△A′B′C′,A′C′分别交于点E、D,设旋转角为a(0°<a<360°).
1年前
Six years ago, my interest in football started when I watched the 2006 World Cup.
1年前
I was a student from the countryside. My teachers thought I was the 小题1:________ student.
1年前
k2CO3 ,NaOH,CuCl2,AgNO3,两两相组,能生成蓝色沉淀的有?能生成白色沉淀的有?
1年前