A.自上而下;自左向右B.自下而上;自左向右C.自上而下;自右向左D.自下而上;自右向左
A.90°,90°,90°B.90°,135°,135°C.45°,45°,45°D.120°,120°,120°
A.原點(diǎn)B.交點(diǎn)C.中點(diǎn)D.重點(diǎn)