采煤机检修时,滑靴磨损量不超过()mm。A、5 B、10 C、12 D、15

题型:单项选择题

问题:

采煤机检修时,滑靴磨损量不超过()mm。

A、5

B、10

C、12

D、15

考点:采煤工采煤工题库
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把加粗字正确解释的序号填在括号里。

满:A.全部,充实;B.全;C.使满;D.满足;E.达到一定期限;F.骄傲。

1.我等不及十月怀胎期,提早来到了人间。(  )

2.奶奶看不过我被整得脸的泪水和汗水。(  )

3.我演到一半时,两个人开始窃窃私语,身为主演的我大为不。(  )

题型:单项选择题

肼屈嗪引起心率加快的原因是

A.降低血压,反射性兴奋交感神经
B.异位节律点自律性增高
C.直接提高窦房结的自律性
D.阻断突触前膜α2受体,递质释放增多
E.阻断副交感神经节

题型:单项选择题

下列属于地下水的动态特征的是( )。

A.容水性

B.流向

C.水位随时间的变化规律

D.物理性质

题型:单项选择题

Cairo is a city of_______

A.Sri Lanka
B.Denmark
C.Egypt
D.Indonesia

题型:单项选择题

Passage Two

With unemployment rising and housing costs still high, cities around the country are experiencing a new and sudden wave of homelessness. Shelters are overflowing, and more people this year are sleeping on floors in dingy social service centers, living in cars or spending nights on the streets.
In New York, Boston and other dries, homelessness is at record levels, a consequence of a faltering (摇晃的) economy that has crumbled even further after the Sept. 11 attacks.
A survey by the U. S. Conference of Mayors released last week found that requests for emergency shelter in 27 cities had increased an average of 13 percent over last year. The report said the increases were 26 percent in Trenton; 25 percent in Kansas City, Mo.; 22 percent in Chicago; 20 percent in Denver; and 20 percent in New Orleans.
An unusual confluence of factors seems to be responsible for the surge. Housing prices, which soared in the expansion of the 1990’s, have not gone down, even though the economy has tumbled. A stream of layoffs has newly unemployed people taking low-wage jobs that might have otherwise gone to the poor. Benefits for welfare recipients are expiring under government imposed deadlines. And charitable donations to programs that help the disadvantaged are down considerably, officials around the country said, because of the economy and the outpouring of donations for people affected by Sept. 11.
"This is an unprecedented convergence (集中) of calamities (灾难) ," said Xavier De Souza Briggs, an assistant professor of public policy at the John F. Kennedy School of Government at Harvard. "It’s really a crisis. "
More than half the cities surveyed by the mayors’ group reported that in the last year people had remained homeless longer, an average of six months.
There is no total number for the homeless nationwide. Experts said it was difficult to compare the situation with statistics in previous decades, because counting methods have improved. Yet, several experts said they believed that the increases reported by cities like Boston and Chicago reflected a national trend.
"My impression is there is more homelessness now than there was 20 years ago," Gary Burtless, an economist at the Brookings Institution, said, adding that he believed that economic factors were not the sole explanation.
"I think that there must be a greater segment of our population that has tenuous connections to family and friends, and therefore has fewer resources to fall back on when something very bad happens like when they lose their job," he said.

Charitable donations for the disadvantaged decreased because ______.

A.the U.S. economy has tumbled

B.more people donated for people affected by Sept. 11 attacks

C.more people stopped donating since they found the donations were misused

D.both A and B

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