为细胞周期非特异性药物() A.阿糖胞苷 B.长春新碱 C.环磷酰胺 D.维A酸 E

题型:单项选择题 B型题

问题:

为细胞周期非特异性药物()

A.阿糖胞苷

B.长春新碱

C.环磷酰胺

D.维A酸

E.门冬酰胺酶

考点:血液病主治医师血液病主治医师相关专业知识历年真题精选(B型题1)
题型:单项选择题 B型题

已知等差数列{an}的首项为a,公差为b,且不等式ax2-3x+2>0的解集为(-∞,1)∪(b,+∞),

(1)求数列{an}的通项公式及前n项和Sn

(2)比较an和Sn-4的大小。

题型:单项选择题 B型题

鸦片战争是中国近代史的开端,主要是因为[ ]

A.鸦片战争使中国的社会性质发生了变化

B.使中国的社会的主要矛盾发生了变化

C.使中国人民的革命任务发生了变化

D.鸦片战争是第一次反侵略战争的失败√

题型:单项选择题 B型题

下列食物中嘌呤含量最低的是()

A.菠菜

B.面包

C.牛肉

D.肉汁

E.奶酪

题型:单项选择题 B型题

Passage Three

You wouldn’t expect an Information Age company like Intel to get on the wrong side of environmentalists, but the company’s recent 42 billion expansion at Rio Rancho, New Mexico, plunged the world’s largest semiconductor maker into an age-old Western problem., water rights. Chip plants consume millions of gallons of water a day, mainly to wash microscopic dirt from the surface of chips. That’s a problem in the dry West, where, as Twain remarked, whiskey is for drinking, water is for fighting about.
During construction of the new 1.3 million-square-foot chip-making plant, which starts pro duction this month, residents and activists complained that the company’s expanding thirst would be too great a drain on local supplies. After weeks of public hearings, the state of New Mexico last year granted Intel 72% of the water it requested.
The strife at Rio Rancho is the most intense the industry has faced."I think it sensitized us," says Howard High, spokesman for Intel. "We have a lot of efforts under way to try and minimize the amount of water we use." Current conservation efforts may not work for an industry that in North America is expected to double in size to $ 75 billion in sales in the next three years.
The trend is to reuse treated wastewater from chip cleaning in places such as cooling towers and air-conditioning systems. Motorola employs such methods in Phoenix and Austin. Recycling water for chip cleaning is the most logical approach. But the technology to make ultra-pure water for such a closed-loop system is still too costly.
New technologies could eventually take the water out of chip cleaning. One company, Radiance Services, a six-person start-up based in Bethesda, Maryland, holds patents for a new "dry cleaning" method.Using laser light and inert gas (惰性气体) to lift impurities (杂质,不洁物) from surfaces of a chip, Radiance claims its process can clean as effectively as the current water- based methods.

What is the main subject of this passage

A.Chipmakers face a water problem.

B.Intel causes pollution to environment.

C.Shortage of water resources in Information Age.

D.Intel’s new technology of saving water.

题型:单项选择题 B型题

安全验收评价是指运用系统安全工程原理和方法,在项目建成()后,在正式()前进行的一种检查性安全评价。

A.试生产正常运行投产

B.验收完成生产

C.验收完成投产

D.投人生产验收

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