已知a,b是实数,则“a>0且b>0”是“a+b>0且ab>0”的 [ ]
A.充分而不必要条件
B.必要而不充分条件
C.充分必要条件
D.既不充分也不必要条件
答案:C
Only when the war was over ____ to his home town. [ ]
A. did the young soldier return
B. the young soldier returned
C. returned the young soldier
D. the young soldier did return
某企业正在进行风险报酬的财务分析,经分析得知本企业股票的报酬率及其概率分布情况如下表所示:
某企业股票报酬率及其概率分布
根据风险报酬原理,应投资于( )的项目。
A.期望报酬率较高,风险也较高
B.期望报酬率较高,而风险较低
C.期望报酬率较低,而风险较高
D.期望报酬率较低,风险也较低