何谓水泵的有效汽蚀余量和必需汽蚀余量?

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问题:

何谓水泵的有效汽蚀余量和必需汽蚀余量?

考点:汽轮机检修汽轮机运行与检修汽轮机运行与检修题库
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读下面各数时,读出一个零的是______,不需要读出零的是______,读出两个零的是______

A.803024900 B.830024900 C.832004900.

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2010年某省社会消费品分月零售额及增幅

2010年该省分行业零售额(单位:亿元)

以下说法错误的是()。

A.2010年3月的零售额在12个月中是最少的

B.2010年1月的零售增幅在12个月中是最小的

C.2010年限额以上企业零售额占社会消费品零售总额的比重超过50%

D.2010年批发零售业零售额占社会消费品零售总额的比重超过50%

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填空

     Wang Kun and his sister had 1. __________ about

taking a great bike trip ever 2._______middle school.

After 3.________ from college, they 4. ________got the

chance to make their dream come true. His sister thought

of the idea t0 5.________ along the Mekong River.  They

both bought expensive bikes. Wang Wei also got their

cousins 6. __________ in cycling.  Wang Wei 7. _______ to

the idea that they should find the source and begin their

journey there. When she heard that the 8. __________ of the

Mekong River is in Qinghai Province, she wouldn't

9.________her mind. She even felt excited when she

knew that their journey would begin at an 10. _________ of

more than 5,000 metres.  Before the trip they found a large

atlas in the library.  From the atlas they knew clearly about

the Mekong River.

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患者女性,60岁,有喘息性支气管炎病史20余年,近2年有下肢水肿。5天前受凉,咳嗽加重,彻夜不眠,意识模糊伴躁动不安。尿常规检查正常。血气分析显示:pH7.14,PaO48mmHg,PaCO85mmHg,HCO30mmol/L。符合()

A.原发性代谢性酸中毒,失代偿

B.原发性呼吸性酸中毒,代谢性酸中毒,失代偿

C.原发性呼吸性酸中毒+原发性代谢性酸中毒

D.原发性呼吸性酸中毒+原发性代谢性碱中毒

E.原发性代谢性酸中毒,代偿

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试析美德帝国主义国家的特点。

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