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【单选题】
股票A和股票B的概率分布如下：状态概率A股票的收益率(%)B股票的收益率(%)10.1010820.2013730.2012640.3014950.20158 假设有最小方差资产组合G，股票A和股票B在资产组合G中的权重分别为多少？A.
0.40 ， 0.60
B.
0.66 ， 0.34
C.
0.34 ， 0.66
D.
0.24 ， 0.76
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举一反三
【单选题】James has just arrived, but I didn’t know he _________ until yesterday.
A.
will come
B.
was coming
C.
had been coming
D.
comes
【单选题】James has just arrived, but I didnt know he ______ until yesterday.[2005]
A.
will come
B.
was coming
C.
had been coming
D.
came
【简答题】从类型、模式、物流、支付 4 个方面,分析天猫、京东、凡客诚品三种 B2C 网站各自的经营特点?
【单选题】James has just arrived, but I didn’t know he _______ until yesterday.
A.
will come
B.
was coming
C.
had come
D.
came
【多选题】关于墙承式楼梯说法正确的是( )。
A.
不需要设梯梁和平台梁,故构造简单,制作、安装简便,节约材料
B.
主要适用于直跑楼梯。若为双跑平行楼梯,则需要在楼梯间中部设墙,以支承踏步
C.
预制踏步一般采用L形,或加砌立砖做踢板的一字形
D.
为减少视线遮挡,避免碰撞,可在墙上适当部位开设观察孔
【单选题】James has Just arrived, but I didnt know he ______until yesterday.
A.
wiU come
B.
was coming
C.
has been coming
D.
came
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