A.樣沖、鋼卷尺 B.角尺、劃針 C.劃針、樣沖、角尺、單腳規(guī)等 D.單腳規(guī)、鋼卷尺等
A.15°—20° B.15°—30° C.25°—30° D.25°—40°
A.15°—30° B.25°—30° C.25°—40° D.45°—70°