水泵不吸水,真空表指示高度真空,原因是底阀没打开或过滤水部分淤塞。

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问题:

水泵不吸水,真空表指示高度真空,原因是底阀没打开或过滤水部分淤塞。

考点:管工高级管工高级
题型:判断题

读童谣,并用字母n的代数式补全这首童谣:

1只青蛙1张嘴,2只眼睛4条腿,1声扑通跳下水;2只青蛙2张嘴,4只眼睛8条腿,2声扑通跳下水;3只青蛙3张嘴,6只眼睛12条腿,3声扑通跳下水;  …;

______,______,______.

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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.

From the text, we know that the "baby boomers" are a group of people who()

A. have gradually become more noticeable

B. are worried about getting old too quickly

C. are enjoying a good life with plenty of money to spend

D. try living a different life from their parents when they were young

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以下哪一项不属于燃烧发生的必要要素()

A、可燃物

B、二氧化碳

C、助燃物

D、温度

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提高胃癌治愈率的关键在于()

A.术前、术中、术后化疗

B.根治性手术

C.早期诊断

D.放射治疗

E.综合治疗

题型:判断题

CY-101型磁压力式氧分析仪的技术指标有哪些?

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