在双代号网络计划中,已知其计划工期等于计算工期,且某工作的完成节点为关键节点,该工作

题型:单项选择题

问题:

在双代号网络计划中,已知其计划工期等于计算工期,且某工作的完成节点为关键节点,该工作的( )。

A.总时差大于自由时差

B.总时差等于自由时差

C.总时差小于自由时差

D.总时差与自由时差无关

考点:设备监理师质量、投资、进度控制进度控制、投资、质量综合
题型:单项选择题

大豆根尖细胞所含的核酸中,含有碱基A、G、C、T的核苷酸种类数共有[ ]

A.8

B.7

C.5

D.4

题型:单项选择题

股权分置改革的完成表明( )等一系列问题逐步得到解决。

A.国有资产管理体制改革的制度缺陷

B.国有资产历史遗留的制度性缺陷问题

C.证券市场价格波动的巨大风险

D.被扭曲的证券市场定价机制

E.公司治理缺乏共同利益基础

题型:单项选择题

Deputy Agriculture Secretary Kathleen Merrigan sees an epidemic (流行病) sweeping across America’s farmland. It has little to do with the usual challenges, such as flood, rising fuel prices and crop-eating insects. The country’s farmers are getting older, and there are fewer people standing in line to take their place. National agricultural census (普查) figures show that the fastest-growing group of farmers is the part over 65. Merrigan is afraid the average age will be even higher when the 2012 statistics are completed.

Merrigan, a former college professor, is making stops at universities across the country in hopes of encouraging more students to think about careers in agriculture. Aside from trying to stop the graying of America’s farmers, her work is made tougher by a recent blog posting that put agriculture at No. 1 on a list of “useless” college degrees. Top federal agriculture officials are talking about the posting, and it has the attention of agricultural organizations across the country.

“There couldn’t be anything that’s more incorrect,” Merrigan said. “We know that there aren’t enough qualified graduates to fill the jobs that are out there in American agriculture.”

In addition, a growing world population that some experts predict will require 70% more food production by 2050, she said.

“I truly believe we’re at a golden age of agriculture. Global demand is at an all-time record high, and global supplies are at all-time record lows,” said Matt Rush, director of the Texas Farm Bureau. “Production costs are going to be valuable enough that younger people are going to have the opportunity to be involved in agriculture.”

The Department of Agriculture has programs aimed at developing more farmers and at increasing interest in locally grown food. The National Young Farmers’ Coalition has also been pushing for state and federal policy changes to make it easier for new farmers.

Ryan Best, president of Future Farmers of America, has been living out of a suitcase, traveling the country and visiting with high school students about careers in agriculture. The 21-year-old Best hopes his message—that this is a new time in agriculture—will motivate the next generation to turn around the statistics. “Never before have we had the innovations (创新) in technology which have led to agriculture in this country being the most efficient it has ever been,” he said. “There’s really a place for everybody to fit in.”

小题1:What is the new challenge to American agriculture?

A.Fewer and older farmers.

B.Higher fuel prices.

C.More natural disasters.

D.Lower agricultural output.小题2:Why is Merrigan visiting universities across the country?

A.To draw federal agriculture officials’ attention.

B.To select qualified agriculture graduates.

C.To clarify a recent blog posting.

D.To talk more students into farming careers.小题3:According to Matt Rush, American agriculture will provide opportunities for younger people

because__________..

A.the government will cover production costs

B.global food supplies will be even lower

C.investment in agriculture will be profitable

D.America will increase its food export小题4:What do the underlined words “to turn around the statistics” in the last paragraph mean?

A.To re-analyze the result of the national census.

B.To increase agricultural production.

C.To bring down the average age of farmers.

D.To invest more in agriculture.

题型:单项选择题

我国水资源的时空分布极不合理,使本来已经非常缺乏的水资源得不到合理利用。()

题型:单项选择题

地球的外部圈层包括大气圈、水圈、生物圈等,这些圈层之间相互联系、相互制约,形成人类赖以生存和发展的自然环境。结合地球外部圈层构造示意图,完成问题。

B圈层是一个()

A.不连续、有规则的圈层

B.连续、不规则的圈层

C.连续、有规则的圈层

D.不连续、不规则的圈层

更多题库