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【单选题】
设随机变量X与Y相互独立，且X在区间[0,2]上服从均匀分布，Y服从参数为3的指数分布，则数学期望E(XY)等于( )。A.
4/3
B.
1
C.
2/3
D.
1/3
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反馈参考答案：
举一反三
【单选题】________, even he was sometimes touched by doubt, but in contrast to many other leading political figures, his faith in the country was remarkably strong and consistent.
A.
Allowedly
B.
Consequently
C.
Invariably
D.
Admittedly
【多选题】紫苏叶的性状特征有( )。
A.
叶片完整者展平后呈卵圆形，边缘具圆锯齿
B.
两面紫色或上表面紫色，下表面绿色
C.
下表面有多数凹点状腺鳞
D.
带嫩枝者，枝紫绿色，断面中部无髓
E.
气清香，味微辛
【简答题】In contrast to many other cultures, the primary responsibility of the American family member is not to advance the family as a group, either socially or economically.
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