什么叫漏风率,漏风主要表现在哪些部位?我国测定漏风率的方法有哪些?

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问题:

什么叫漏风率,漏风主要表现在哪些部位?我国测定漏风率的方法有哪些?

考点:风机工高级风机工高级风机工题库
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在式子
x
2
(x>0),
2
y+1
(y=-2),
-2x
(x<0),
33
x2+1
,x+y
中,二次根式有(  )
A.2个B.3个C.4个D.5个
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以下各项中,可以采用托收承付结算方式的是()。

A.寄销方式的商品销售

B.代销方式的商品销售

C.赊销方式的商品销售

D.发货制方式的商品销售

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23He可以作为核聚变材料.下列关于23He的叙述正确的是(  )

A.23He和13He互为同位素

B.23He原子核内中子数为2

C.23He原子核外电子数为2

D.23He代表原子核内有2个质子和3个中子的氦原子

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( )是以公安机关人民警察队伍接受检阅为形式。

A.警容风纪
B.警歌
C.警徽
D.阅警

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When it comes to the slowing economy, Ellen Spero isn’t biting her nails just yet. But the 47-year-old manicurist isn’t cutting, filling or polishing as many nails as she’d like to, either. Most of her clients spend $12 to $50 weekly, but last month two longtime customers suddenly stopped showing up. Spero blames the softening economy. "I’m a good economic indicator," she says. "I provide a service that people can do without when they’re concerned about saving some dollars." So Spero is downscaling, shopping at middle-brow Dillard’s department store near her suburban Cleveland home, instead of Neiman Marcus. "I don’t know if other clients are going to abandon me, too," she says.

Even before Alan Greenspan’s admission that America’s red-hot economy is cooling, lots of working folks had already seen signs of the slowdown themselves. From car dealerships to Gap outlets, sales have been lagging for months as shoppers temper their spending. For retailers, who last year took in 24 percent of their revenue between Thanksgiving and Christmas, the cautious approach is coming at a crucial time. Already, experts say, holiday sales are off 7 percent from last year’s pace. But don’t sound any alarms just yet. Consumers seem only mildly concerned, not panicked, and many say they remain optimistic about the economy’s long-term prospects, even as they do some modest belt-tightening.

Consumers say they’re not in despair because, despite the dreadful headlines, their own fortunes still feel pretty good. Home prices are holding steady in most regions. In Manhattan, "there’s a new gold rush happening in the $4 million to $10 million range, predominantly fed by Wall Street bonuses," says broker Barbara Corcoran. In San Francisco, prices are still rising even as frenzied overbidding quiets. "Instead of 20 to 30 offers, now maybe you only get two or three," says John Tealdi, a Bay Area real-estate broker. And most folks still feel pretty comfortable about their ability to find and keep a job.

Many folks see silver linings to this slowdown. Potential home buyers would cheer for lower interest rates. Employers wouldn’t mind a little fewer bubbles in the job market. Many consumers seem to have been influenced by stock-market swings, which investors now view as a necessary ingredient to a sustained boom. Diners might see an upside, too. Getting a table at Manhattan’s hot new Alain Ducasse restaurant used to be impossible. Not anymore. For that, Greenspan ~ Co. may still be worth toasting.

When mentioning "the $4 million to $10 million range" (Lines 4, Para. 3), the author is talking about ()

A. gold market

B. real estate

C. stock exchange

D. venture investment

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