单项选择题
A.48,100B.48,500C.150,500D.100,500
A.10L/min~15L/minB.15L/min~20L/minC.20L/min~25L/minD.25L/min~30L/min
A.60°,45°B.45°,60°C.50°,50°D.80°,50°