A、粒徑大于2mm的顆粒質(zhì)量占總質(zhì)量50% B、粒徑大于0.5mm的顆粒質(zhì)量占總質(zhì)量50% C、粒徑大于0.25mm的顆粒質(zhì)量占總質(zhì)量50% D、粒徑大于0.25mm的顆粒質(zhì)量占總質(zhì)量25-50%