問答題
單項(xiàng)選擇題
A.帶寬 B.600mm C.1米 D.4米
A.小于5 B.9-25 C.25-45 D.100
A.最小尺寸 B.最大尺寸 C.平均尺寸 D.任一尺寸
A.20° B.18° C.16° D.15°
A.3 B.2 C.1 D.4
A.20m B.30m C.40m D.50m