A.1/2~1/3 B.1/3~1/4 C.1/5~1/6 D.1/2~1/4
A.3 B.6 C.9 D.12
A.沒有風 B.環(huán)刀體積準確 C.烘箱是新的 D.有機質(zhì)土含量較小