A.20%~30% B.30%~60% C.10%~20% D.50%~60%
A.砂土>壤土>黏土 B.壤土>砂土>黏土 C.黏土>砂土>壤土 D.黏土>壤土>砂土
A.氮肥 B.磷肥 C.鉀肥 D.餅肥