具有活血祛瘀、清热凉血功效的药物是()。
A.牡丹皮
B.银柴胡
C.胡黄连
D.青蒿
E.地骨皮
参考答案:A
图示刚架,EI为常数,A支座的弯矩(以上侧受拉为正)为()。
A.A
B.B
C.C
D.D
The________of the research is to try and find out more about the causes of the disease.[ ]
A. suggestion
B. effort
C. form
D. purpose