提高土壤有机质的措施有()
A.广辟肥源,增施有机肥料
B.合理轮作,用养结合
C.客土掺沙
D.客土掺黏
参考答案:A, B
对联:“哀怨托离骚,生而独开诗赋立;孤忠报楚国,余风波及汉湘人”。所描写的人物是[ ]
A.李冰
B.孔子
C.司马迁
D.屈原
Which type of unemployment describes situations where qualified workers are not immediately matched with existing job openings()
A. Structural.
B. Cyclical.
C. Frictional.