A.10%~20% B.30%~50% C.70%~80% D.80%~90%
A.3℃ B.8℃ C.15℃ D.18℃
A.地膜-藥土-營養(yǎng)土-種子-藥土-土壤 B.地膜-營養(yǎng)土-藥土-營養(yǎng)土-種子-土壤 C.地膜-藥土-營養(yǎng)土-種子-營養(yǎng)土-土壤 D.地膜-營養(yǎng)土-藥土-種子-營養(yǎng)土-土壤