单项选择题
A.0.15L/S B.0.2L/s C.0.33L/s D.0.5L/s
A.80~140mm B.140~200mm C.200~260mm D.260~320mm
A.0.1°~0.2° B.0.01°~0.02° C.0.2°~0.3° D.0.02°~0.03°