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【单选题】Losing Weight Girls as young as 10 years old are dieting and in danger of developing unhealthy attitudes to weight, body image and food, a group of Toronto researchers reported Tuesday. Their study of...
A.
had unhealthy attitudes to weight.
B.
were overweight.
C.
were on a diet.
D.
had healthy weights.
【多选题】蒙特卡罗法的主要优点是（）
A.
计算简单快捷
B.
解决了统计学概念上的厚尾问题（但只有在市场场景设置有效的情况下）
C.
应用灵活，能够计算非线性的资产组合的风险值
D.
不存在取样风险
【单选题】在列写结点电压法时,自导___,互导___。下列叙述正确的是( )。 prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace>
A.
恒为正，有正、负
B.
恒为正，恒为负
C.
有正、负，恒为负
D.
恒为负，恒为正