①勤奋学习 ②自觉劳动 ③用于创造 ④因循守旧
A:①②③
B:②③④
C:①②④
D:①③④
下列说法:①直径是弦;②经过三点一定可以作圆;③三角形的外心到三角形各顶点的距离相等;④长度相等的弧是等弧;⑤平分弦的直径垂直于弦.其中正确的是____ (填序号).
One should take ______ of his strengths to make up for his weaknesses.