装置用除氧水溶解氧控制值为（）ppb。 A.≤7 B.≤6 C.≤5 D.≤8

当确定供应商评价标准的权重时，（）是设定权重的基础。

A、公司的供应目标

B、采购品项的指出水平

C、采购品项的类型

D、对供应商信息调查的情况

将体积都为10 mL、pH都等于3的醋酸和盐酸，加水稀释至a mL和b mL，测得稀释后溶液的pH均为5。则稀释后溶液的体积（     ）

A．a="b=100" mL

B．a="b=1000" mL

C．a>b

D．a<b

阅读材料，完成下列问题。

材料一：2010年10月5日凌晨5时25分，因连续降雨天气导致贵州遵义市桐梓县大河镇芭蕉村境内发生山体滑坡，川黔铁路大河坝至新场间山体坍塌千余立方米，区间铁路被迫中断。川黔铁路发生险情后，铁路部门立即启动应急预案，经过抢险救援人员连续奋战，共清理坍体1500立方米，川黔铁路在中断21小时后顺利抢通。

材料二：川黔铁路滑坡分布图

（1）我国东部地区的降水主要类型是[ ]

A．台风雨

B．对流雨

C．锋面雨

D．地形雨

（2）结合材料，请你谈谈降水对人们的影响有哪些？

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（3）在我国山区，请你列举强降雨有可能导致的地质灾害有哪些？为此，山区应当采取哪些措施来减少此类灾害的发生？

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The days of elderly women doing nothing but cooking huge meals on holidays are gone. Enter the Red Hat Society--a group holding the belief that old ladies should have fun.

"My grandmothers didn’ t do anything but keep house and serve everybody. They were programmed to do that," said Emily Cornette, head of a chapter of the 7-year-old Red Hat Society.

While men have long spent their time fishing and playing golf, women have sometimes seemed to become unnoticed as they age. But the generation now turning 50 is the baby boomers(生育高峰期出生的人), and the same people who refused their parents’ way of being young are now trying a new way of growing old.

If you take into consideration feminism(女权主义), a bit of spare money, and better health for most elderly, the Red Hat Society looks almost inevitable(必然的). In this society, women over 50 wear red hats and purple(紫色的) clothes, while the women under 50 wear pink hats and light purple clothing.

"The organization took the idea from a poem by Jenny Joseph that begins: When I am an old woman, I shall wear purple. With a red hat which doesn’ t go," said Ellen Cooper, who founded the Red Hat Society in 1998. When the ladies started to wear the red hats, they attracted lots of attention.

"The point of this is that we need a rest from always doing something for someone else," Cooper said, "Women feel so ashamed and sorry when they do something for themselves. " This is why chapters are discouraged from raising money or doing anything useful. "We’ re a ladies’ play group. It couldn’ t be more simple," added Cooper’ s assistant Joe Heywood.

Women join the Red Hat Society because（）

A. they want to stay young

B. they would like to appear more attractive

C. they would like to have fun and live for themselves

D. they want to be more like their parents

分析化学应用于工业生产领域的各种物料时，就形成了分析化学的一个分支叫（）。