A.2.5mm B.0.074mm C.0.5mm D.4.75mm
A.粒徑不大于0.5mm土 B.有機(jī)土 C.細(xì)粒土 D.粗細(xì)混合土
A.六偏磷酸鈉 B.氫氧化鈉 C.草酸鈉