商业促销方式主要是哪2种？

A. 精耕细作和增施有机肥
B. 合理轮作
C. 施用土壤结构改良剂
D. 施用草木灰

A. 正确
B. 错误

A. at a maximum rate of two ounces per day
B. after mixing with an equal quantity of fresh water
C. if gather during or immediately after a hard rain
D. under no circumstance