BC |
BD |
BC |
BD |
A.2对 | B.3对 | C.4对 | D.5对 |
A.30° | B.30°或150° | C.60° | D.60°或120° |
A.40° | B.50° | C.70° | D.110° |
A.直径所对的圆周角是直角 |
B.圆既是轴对称图形,又是中心对称图形 |
C.三点确定一个圆 |
D.在同圆中,相等的圆周角所对的弦相等 |
A.PC=1,PD=12 | B.PC=3,PD=4 |
C.PC=3,PD=5 | D.PC=8,PD=1.5 |
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