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问题 单项选择题

用pH梯度萃取法从三氯甲烷中分离生物碱时，可顺次用缓冲液萃取（）

A.pH=8～3

B.pH=3～5

C.pH=6～8

D.pH=8～14

E.pH=14～8

答案

参考答案：A

单项选择题

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

We offer a broad spectrum of virtualization（）that allows customers to choose the most appropriate path and optimization focus for their IT infrastructure resources.

A．solutions

B．networks

C．interfaces

D．connections
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单项选择题

衡量健康生命损失情况的单位，用年数表示，将早死导致的健康生命年损失和残疾导致的健康生命年损失结合起来，构成生命数量和生活质量以时间为单位的综合性指标指的是（）

A.减寿人年数

B.无残疾期望寿命

C.活动期望寿命

D.伤残调整生命年

E.健康期望寿命
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