“多CTA投资组合”的方差比单个CTA的方差小，多CTA投资策略能在相同的回报率的水平下，降低投资者的风险水平。( )
参考答案：对
After the new machine was introduced, the factory produced _____ in 2011 as the year before.
A．twice as many machines
B．twice many as machines
C．as twice many machines
D．as many machines twice
疟原虫在人体内的发育：在肝细胞内为裂体增殖称（）（红外期），在红细胞内发育包括（）和（）的形成。
