施用有机肥料有哪些弊端,应如何克服?
参考答案:
弊端:易造成肥效下降,利用率降低,土壤耕性变差,甚至养分比例失调,农产品品质下降。有机肥料与化肥配合施用。
根据首字母或汉语提示写单词。
1. A dog is an a_____, so is a cow.
2. I can't do the work myself, can you g_____ me a hand?
3. Dan is a l_____ boy, he never does the cleaning.
4. Elephant is a_____ extinct in China.
5. You can k_____ the book for two weeks, but you must give it back.
6. How many _____ (出口) are there in the cinema?
7. Tigers are _____ (危险) animals.
8. Keep the window _____ (开着). It's too hot.
9. Why is she standing _____ (静止的)?
10. I am very _____ (惊奇的) at the news.
高密度培养