选择性作用于β1受体的药物是 A.多巴胺 B.多巴酚丁胺 C.去甲肾上腺素 D.

题型:单项选择题

问题:

选择性作用于β1受体的药物是

A.多巴胺
B.多巴酚丁胺
C.去甲肾上腺素
D.麻黄碱
E.异丙肾上腺素

考点:西药执业药师药学专业知识(一)西药执业药师药学专业知识(一)
题型:单项选择题

钢筋焊接接头质量验收时只作力学性能检验。

题型:单项选择题

如图所示,质量为m的木块在质量为M的长木板上受到向右的拉力F的作用而向右滑行,长木板处于静止状态,已知木块与木板间的动摩擦因数为μ1,木板与地面间的动摩擦因数为μ2.下列说法正确的是(  )

A.当F>μ2(m+M)g时,木板便会开始运动

B.木板受到地面的摩擦力的大小一定是μ2(m+M)g

C.木板受到地面的摩擦力的大小一定是μ1mg

D.无论怎样改变F的大小,木板都不可能运动

题型:单项选择题

Special Bridges Help Animals Cross the Road

-- Reported by Sheila Carrick

Why did the chicken cross the road? To get to the other side.

Most people know this joke. But recently, some people have been much more concerned with how the grizzly bear and mountain lion can cross the road.

Millions of animals die each year on U.S. roads, the Federal Highway Administration reports. In fact, only about 80 ocelots, an endangered wild cat, exist in the U.S. today. The main reason? Roadkill.

"Ecopassages" may help animals cross the road without being hit by cars. They are paths both over and under roads. "These ecopassages can be extremely useful, so that wildlife can avoid human conflicts," said Jodi Hilty of the Wildlife Conservation Society.

But do animals actually use the ecopassages? The answer is yes. Paul Beier of Northern Arizona University found foot marks left by mountain lions on an ecopassage that went under a highway. This showed that the lion used the passage.

Builders of some ecopassages try to make them look like a natural part of an area by planting trees on and around them. Animals seem to be catching on. Animals as different as salamanders and grizzly bears are using the bridges and underpasses.

The next time you visit a park or drive through an area with a lot of wildlife, look around. You might see an animal overpass!

小题1:The writer uses the example of “ocelots” to show that_________.

A.wild animals have become more dangerous

B.the driving conditions have improved greatly

C.the measure for protecting wildlife fails to work

D.an increasing number of animals are killed in road accidents小题2:From the news story, we know an ecopassage is_________.

A.an underground path for cars

B.a fence built for the safety of the area

C.a bridge for animals to get over a river

D.a pass for animals to cross the road小题3:When the writer says that animals seem “to be catching on”, he means_________.

A.animals begin to realize the dangers on the road

B.animals begin to learn to use ecopassages

C.animals are crossing the road in groups

D.animals are increasing in number小题4:The writer asks visitors and drivers to look around when traveling because_________.

A.wild animals may attack cars

B.wild animals may jam the road

C.they may see wild animals in the park

D.they may see wild animals on ecopassages

题型:单项选择题

伪造或者故意破坏事故现场的,对主要负责人、直接负责的主管人员和其他直接责任人员处上一年年收入60%至()的罚款。

A.70%

B.80%

C.90%

D.100%

题型:单项选择题

进行油气层对比第一步要做的是()。

A.进行水平对比

B.确定标准层,建立油田标准剖面

C.给油气层编号

D.编制分层数据表

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