可用对立制约说明的是()
A.阴阳相错,而变由生也
B.动极镇之以静
C.阴在内,阳之守也
D.寒极生热,热极生寒
E.重阴必阳,重阳必阴
参考答案:B
_____ trees are cut down in the forests every year. [ ]
A. Thousand
B. Thousands
C. Thousand of
D. Thousands of
实验家兔需使用阿托品量相当于人类公斤剂量的()
A.25~30倍
B.5~10倍
C.10~15倍
D.10~20倍
E.20~25倍