国外农业现代化道路类型有哪些?
参考答案:
第一种是地广人稀,劳动力紧张的国家,以美国、前苏联、加拿大为典型;
第二种是人多地少,劳动力充裕的国家,以日本、荷兰等地为典型;
His wife was ill in hospital, but____ it didn't havemuch influence on his research work. [ ]
A. fortunately
B .eventually
C. certainly
D. surprisingly
原发性侧索硬化主要选择性地损害()
A.锥体束
B.周围神经
C.感觉传导通路
D.脊髓前角细胞
E.锥体外系