两个带相同电荷量、同种电荷的带电粒子,质量不同,同时以大小为v0而方向相反的速度

题型:选择题

问题:

两个带相同电荷量、同种电荷的带电粒子,质量不同,同时以大小为v0而方向相反的速度垂直场强方向进入场强为E的同一足够大的匀强电场中,如图所示,不计重力,而且它们在场内也不会相碰.在粒子射入电场经时间Δt后,下面说法正确的( )

A.速度有可能相同

B.动量有可能相同

C.动量变化相同

D.动能变化相同

考点:带电粒子在电场中的偏转
题型:选择题

刘某为甲有限责任公司总经理,甲公司主要经营体育用品销售业务,任职期间,刘某擅自代理乙公司从国外进口一批体育用品并将其销售给丙公司。根据公司法律制度的规定,下列说法正确的有( )。

A.如果刘某的行为经过股东会的同意,则不违反公司法律制度的规定

B.甲公司董事会可以决定将刘某从事该行为所得的收入收归本公司所有

C.甲公司董事会可以申请人民法院撤销刘某的行为

D.甲公司可以要求刘某、乙公司和丙公司对自己的损失承担连带赔偿责任

题型:选择题

可转换债券

题型:选择题

右图中两条经纬线之间的间距相等,虚线为昏线。读图做下列小题。

此时,下列城市中白昼时间最长的是()

A.堪培拉

B.巴西利亚

C.伦敦

D.圣彼得堡

题型:选择题

超龄劳动者发生事故能否认定工伤王某,男,62周岁,农民,在一工厂从事门卫工作,双方未签订劳动合同,也未办理工伤保险。2009年10月一天,王某在工作中,一辆进厂运货的拖拉机将其撞伤。受伤后王某向当地劳动行政部门要求作工伤认定,劳动行政部门以王某已超过退休年龄为由不予受理。

下列选项中,不属于《工伤保险条例》工商认定的对象有哪些()?

A.离、退休后仍在从事劳动并取得报酬的人员

B.在校学生到用人单位实习期间发生伤亡事故的

C.未与单位签订劳动合同,出现伤残的劳动人员

D.在工作中因自身错误,引起的安全事故问题

题型:选择题

Many small cultural groups live in places far away from modern cities. Some of these tribes have never had any communication outside of their small geographical areas. When they do contact the outside world, their lives usually change. Learning how to change without losing the best of their own cultures is a problem for them. How can primitive cultures learn to live in a technological world How can they do this without becoming lost
One native tribe in New Guinea has a difficult situation. The people of the tribe are being pulled in two ways. First of all, copper, a bright orange-colored metal, has been discovered under the land where they have lived for centuries. Developers want to take the copper out of the ground, to mine it. The tribe needs the money that a copper mine would bring. The problem is that the copper is directly under the most important buildings of their society. These buildings are a necessary part of their religion. How can the copper be mined without changing the group’s religion
The answer to this question has not yet been found. However, a group of people is trying to help the tribe to learn to communicate with the rest of the world. Cultural Survival, Inc. is the name of the group. The people are anthropologists, scientists who study cultures. They want to help small, separate societies live successfully within the larger society. Cultural Survival, Inc. wants to help these groups keep the idea of who they are. It wants to teach them how to live in the modern world.
There is another organization like this in London. It is called Survival International. One in Copenhagen is called the International Workshop for Indigenous Affairs. These two groups have joined with Cultural Survival, Inc., to help people become used to modern culture.
These organizations work with another kind of problem, too. Sometimes a central government does not consider the needs of local people. Often the rich people of a country will get more from a new project than the working people. The poorer people sometimes suffer even more because of these projects. One thoughtless government leader moved the people out of a very large area. He wanted to set up a special vegetable business. He wanted something to sell to earn money from other countries. About 50,000 people were forced off their native land. These people suffered a great loss because they had to leave their homes. Cultural Survival, Inc. helped them.
Cultural Survival, Inc. and its sister organizations also give advice about tourism. The tourism business can cause problems. Many small societies need to earn money, but a large group of visitors can hurt their culture. The Sherpas of Nepal are a good example. The beauty of the Himalayan Mountains brings many mountain climbers from all over the world. However, the tourists leave tin cans and other garbage. What the tourists leave behind in this beautiful area is making a garbage dump. The mountain climbers are also cutting down trees for their fires. This area has few trees, and the Sherpas need the wood for their uses. The Sherpas, it is clear, could use the help of Cultural Survival, Incorporated.

Para. 2 shows that

A.the economy of the native tribe develops rapidly.

B.the tribe is good at mining copper.

C.there is a problem that holds the tribe back from developing.

D.copper is a necessary part of the tribe’s building.

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