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问题 单项选择题

关于队列研究，下列哪项是正确的

A．属于实验法
B．可以直接获得研究人群的发病率或死亡率
C．没有专门设立的对照组
D．由果及因
E．难以判断暴露与结局的时间顺序

答案

参考答案：B

单项选择题

党参组织中有( )

A．油管
B．油室
C．树脂道
D．乳管
E．油细胞
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单项选择题

Virtualization is an approach to IT that pools and shares (36) so that utilization is optimized and supplies automatically meet demanD. Traditional IT environments are often silos, where both technology and human (37) are aligned around an application or business function. With a virtualized (38) , people, processes, and technology are focused on meeting service levels, (39) is allocated dynamically, resources are optimized, and the entire infrastructure is simplified and flexible. We offer a broad spectrum of virtualization (40) that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources.

A．system

B．infrastructure

C．hardware

D．link
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