如果两个项目预期收益的标准差相同,而期望值不同,说明这两个项目()
A.预期收益相同
B.标准离差率不同
C.预期收益不同
D.未来风险报酬相同
参考答案:C
某妇,36岁,停经70天, * * 出血量多,小腹疼痛,腹坠加重。妇检:宫口已开大,见胚胎组织堵塞宫颈口,舌紫黯、有瘀点,脉沉细。首选方是:()
A.宫外孕Ⅱ号方
B.桃红四物汤
C.生化汤
D.脱花煎
E.血府逐瘀汤
It is probably easier for teachers than for students to appreciate the reasons why learning English seems to become increasingly difficult once the basic structures and patterns of the language have been understood.