下面关于PDL语言不正确的说法是（）A.PDL是描述处理过程怎么做 B.PDL是只描

慢性呼吸衰竭缺氧伴二氧化碳潴留时，采用氧疗的给氧浓度正确的是（）。

A.<25％

B.<35％

C.<45％

D.<55％

E.<65％

判定良性与恶性肿瘤，最具诊断意义的是

A．生长速度

B．生长方式

C．对机体的影响

D．出血与坏死

E．肿瘤细胞的异型性

化学行业中把材料分为：金属材料、无机非金属材料、有机高分子材料等。金属材料在现实生活中有极为重要的作用。下列金属材料的运用与金属所具有的性质不一致的是[ ]

A.制造白炽灯灯丝--熔点高

B.制造飞机--坚硬而质轻

C.制造保险丝--硬度大

D.制造装化工原料的容器--耐腐蚀

血管炎病的发病因素中需除外（）。

A.精神紧张

B.环境中的微生物、毒素等促发血管炎的发生

C.有遗传基础者的易感者

D.有潜在免疫异常者

E.以上都不是

With U.S. companies sitting on an estimated $1.8 trillion in cash, it raises the question: Why aren’t they deploying more of their hoard to expand their businesses Or one might channel John Maynard Keynes to ask: Where have the "animal spirits" gone Although capital spending in the U.S. is up 12 percent since the lows of early 2009, it’s still running $88 billion below the peak of $1.34 trillion reached in the first quarter of 2008, says Joseph LaVorgna, chief U.S. economist at Deutsche Bank. He doesn’t expect capital spending to catch up to that peak level and officially start to expand until the second quarter of 2011. (LaVorgna’s definition of capital spending includes physical equipment and software, but not structures such as new stores or manufacturing plants. Spending on structures is about 2 percent of gross domestic product, one-third the size of capital sending’s contribution to GDP, he says.)

"The trend and momentum have definitely turned and it’s just a matter of time before you see other companies give way to capital spending, and eventually that will result in hiring," says LaVorgna. But with spending running $88 billion below peak, he says employment "should be farther along than it is." Companies that have built up a lot of cash are starting to take some chances such as expanding into new markets, which requires hiring new workers, says John Challenger, chief executive officer of Challenger, Gray & Christmas, an employment consulting firm. U.S. companies have announced the hiring of 118,209 new employees through August, according to data collected by the firm.

So who’s stepping up to the plate Some companies refuse to be cowed and are taking big, if calculated, chances, including ambitious capital projects, hiring new workers, and expanded investment in research and development, according to growth-oriented mutual fund managers contacted by Businessweek.com. If there’s a common denominator, it’s a perceived opportunity and confidence in sustainable demand, whether due to new trends in technology or to new markets that need certain products. Other names came from a list of the top-hiring U.S. companies through July 2010 compiled by Challenger, Gray & Christmas.

"We don’t spend capital unless we have a new contract to supply oxygen, nitrogen, or hydrogen to our customers," says James Sawyer, Praxair’s chief financial officer. "Those are 15-year contracts with minimal take-or-pay clauses written into them, which ensure we will get a good return on our capital investment, regardless of how the rest of the economy is doing."

Some younger outfits with entrepreneurial managers who have lived through a few business cycles think their companies may be able to steal a march on competitors more reluctant to spend, says Aram Green, manager of Clear Bridge Advisors Small Cap Growth Fund. "There’s clearly been a decision by management that ’This is not the time to take our foot off the accelerator. In fact, it’s time to push harder and further distance our product from the competition.’\

We can learn from the first paragraph that （）.

A.U.S. capital spending will reach $1.34 trillion in the second quarter of 2011

B.U.S. companies are reluctant to invest due to the product surplus in the market

C.Keynes restricted the "animal spirits" of U.S. companies

D.U.S. companies have not used their capital effectively