井下工作人员必须熟悉灭火器材的使用方法和存放地点。

题型:判断题

问题:

井下工作人员必须熟悉灭火器材的使用方法和存放地点。

考点:煤矿矿井主扇风机操作工煤矿矿井主扇风机操作工题库
题型:判断题

如图所示,一只用绝缘材料制成的半径为R的半球形碗倒扣在水平面上,其内壁上有一质量为m的带正电小球,在竖直向上的电场力F=2mg的作用下静止在距碗口高处。已知小球与碗之间的动摩擦因数为μ,则碗对小球的弹力与摩擦力的大小分别为

A.0.8mg和0.6mg

B.0.8mg和0.8μmg

C.mg和μmg

D.mg和0.6mg

题型:判断题

阅读理解。

     One of the greatest killers in the Western world in heart disease. The death rate (率) from the disease

has been increasing at an alarming speed for the past thirty years. Today in Britain, for example, about

four hundred people a day die of heart disease. Mdical experts know that people can reduce their chances

of getting heart disease by exercising regularly, by not smoking, by changing their diets, and by paying

more attention to reducing stress (压力) in their work.

     However, Western health-care systems are still not paying enough attention to the prevention of the

disease. There is a need for more programs to educate the public about the causes and prevention of heart

disease. Instead of supporting such programs,however, the U.S. health-care system is spending large sums

of money on the surgical (外科的) treatment of the disease after it develops. This emphasis (强调) on

treatment clearly has something to do with the technological advances that have taken place in the past ten

to fifteen years. In this time,modern technology has enabled doctors to develop new surgical techniques.

Many operations that were considered impossible or too risky (有风险的) a few years ago are now

performed every day in U.S.hospitals. The result had been a huge increase in heart surgery.

     Although there is no doubt that heart surgery can help a large number of people, some people point out

that the emphasis on the surgical treatment of the disease has three clear disadvantages. First, it attracts

interest and money away from the question of prevention.Second, it causes the costs of general hospital

care to rise. After hospitals buy the expensive equipment that is necessary for modern heart surgery, they

must try to recover the money they have spent.  To do this, they raise costs for all their patients, not just

those patients whose treatment requires the equipment. The third disadvantage is that doctors are

encouraged to perform surgery-even on patients for whom an operation is unnecessary-because the

equipment and expert skills are there. A government office recently stated that major heart surgery was

often performed even though its chances of success were low. In one type of heart surgery, for example,

only 15 percent of patients improved their conditions after the surgery. However,more than 100,000 of these

operations are performed in the United States every year.

1. What effect has modern technology had on medicine?

A. It has reduced the costs of medical treatment.

B. It has helped save the lives of most patients

C. It has encouraged doctors to do more heart surgeries

D. It has helped educate people about the prevention of heart disease

2. "To do this" (in Paragraph 3)means _____.

A. to help patients recover

B. to increase the number of heart surgeries

C. to get back the money spent on the equipment

D. to buy new equipment for the treatment to heart disease

3. The author would agree that _____.

A. more money should be spent on the prevention of heart disease

B. heart surgery has helped most patients improve their conditions

C. modern technology has made heart surgery more risky than before

D. the public have known a great deal about the causes of heart disease

4. What would be the best title for the passage?

A. The Greatest Killer in the West

B. Heart Disease: Treat or Prevent

C. Modern Technology and Heart Surgery

D. Heart Surgery:Advantages and Disadvantages

题型:判断题

课程采用指在初步实施阶段,不断通过反馈调整课程的实施,最终应用的方案才是课程实施的方案。

题型:判断题

在Premiere中素材播放速度越快,持续时间()

A.随机

B.不变

C.越长

D.越短

题型:判断题

童话作家葛翠琳的代表作是()。

A.《神笔马良》

B.《小猪奴尼》

C.《没头脑和不高兴》

D.《野葡萄》

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