A.19B.20C.21D.22
A.先開(kāi)食后飲水B.飲水開(kāi)食同時(shí)進(jìn)行C.先飲水后開(kāi)食D.開(kāi)食飲水同時(shí)進(jìn)行
A.鈣B.磷C.玉米D.沙礫