【单选题】X服从参数λ=1的泊松分布,Y服从B(4,0.8),已知D(X+Y)=2.6,则
【单选题】设随机变量X与Y相互独立,它们分别服从参数λ=2的泊松分布与指数分布.记Z=X-2Y,则随机变量Z的数学期望与方差分别等于().
【单选题】习近平总书记作出了“中国特色社会主义进入新时代”的重要判断。进入新时代( ) 我国主要矛盾已经发生变化 2.我国的基本国情发生改变 3.是我国发展新的历史方位 4.我国已跻身发达国家行列
【单选题】当今时代,信息化已成为全球经济社会发展的显著特征,以语言文字为主要载体的信息资源日益成为重要生产要素、无形资产和社会财富,迫切要求加速提升语言文字信息化水平。特别是进入21世纪,随着经济社会和文化教育事业的快速发展,社会语言生活发生了巨大变化;随着工业化、城镇化、国际化步伐的加快,语言交流更为频繁,语言服务需求不断增大;随着综合国力不断增强,汉语加快走向世界,汉字的国际影响力不断扩大。这些,都急需...
【单选题】在存款人违反账户管理制度的处罚中,存款人的法定代表人或主要负责人、存款人地址以及其他开户资料的变更事项未在规定期限内通知银行的,给予警告并处以( )元的罚款。
【单选题】Susie's reaction to father's decision was that( ).
A.
She could not understand law at all
B.
She disobeyed father from the very beginning
C.
She obeyed father at first but gradually changed her interest to music
D.
She hated law from the very beginning
【单选题】Susie's reaction to father's decision was that _____.
【单选题】Susie's reaction to father's decision was that ______.
A.
she could not understand law at all
B.
she disobeyed father from the very beginning
C.
she obeyed father at first but gradually changed her interest to music
D.
she hated law from the very beginning