單項(xiàng)選擇題
A.360°/n B.180°/n C.180° D.90°
A.0.1 B.0.2 C.0.3 D.0.5
A.4 B.3 C.2 D.1
A.±10〞 B.±14〞 C.±20〞 D.±40〞
A.1/10000 B.1/8000 C.1/6000 D.1/4000