A.7B.14C.21D.28
A.不大于0.5kg/m2B.不大于0.4kg/m2C.不大于0.3kg/m2D.不大于0.2kg/m2
A.直徑至少200mm,高為200mmB.直徑至少250mm,高至少200mmC.直徑至少250mm,高為250mmD.直徑至少200mm,高為250mm