如图所示,粗糙的斜面与光滑的水平面相连接,滑块沿水平面以速度v0运动。设滑块运动

题型:选择题

问题:

如图所示,粗糙的斜面与光滑的水平面相连接,滑块沿水平面以速度v0运动。设滑块运动到A点的时刻为t=0,滑块离开A点运动过程中距A点的水平距离为x,水平速度为vx。由于v0不同,从A点到B点的几种可能的运动图象如下列选项所示,其中表示摩擦力做功最大的是

考点:牛顿运动定律的应用
题型:选择题

用单位现金收入直接支付单位自身的支出,称为____。

A.透支

B.坐支

C.垫支

D.超支

题型:选择题

上腔静脉压迫综合征的主要原因是()

A.恶性淋巴结 

B.转移癌 

C.良性肿瘤 

D.肺癌 

E.结核病 

题型:选择题

I’ve spent over a year in India, and in those 365 plus days, I’ve learned a lot about getting around Indian cities. My biggest lessons have been learned through being cheated, particularly by taxi and rickshaw (人力车) drivers, but that doesn’t mean those are bad ways to travel, as long as you know what you’re doing. Below are the best ways to get around the city of Delhi, India, and tips for how to keep from being the victim of scams (欺骗).

Taking taxis is a great way to get around the city of Delhi and chances are, if you arrive in Delhi by plane, as soon as you make it through customs, you’ll be swarmed by Indian taxi drivers. At the Delhi airport, be sure to arrange for a taxi to your hotel at one of the two Delhi Traffic Police Taxi Booths. One is inside the airport, and one is outside. The key is to make sure to go to a booth run by the police, rather than by independent taxi drivers.

Rickshaws are one of my favorite ways to get around Indian cities, partly because it’s how the locals often travel. Auto-rickshaws are more common, but bicycle rickshaws are still used in Old Delhi. If you do have a chance to take a bicycle rickshaw, you should do it at least once for a unique experience that should only set you back about 15 rupees. Auto-rickshaw rates around Delhi range between 30 and 80 rupees, depending on distance.

If you really want to travel around Delhi like the locals, take a public bus. Indian buses become very crowded and most do not have air conditioning. They are, however, very cheap. A bus trip won’t set you back any more than 15 rupees, as long as you stay within the city limits. Since Indian buses get so crowded, try to board the bus at the start of the route so you can get a seat.

The train is a great way to get around within the city of Delhi. Fares are reasonable, between six and 22 rupees. All departure announcements are in both Hindi and English, and tokens can be purchased for between six and 22 rupees.

小题1: What is the author trying to do through this text?

A.Expect us to travel around Delhi.

B.Show his/her experiences in Delhi.

C.Give some advice of traveling in Delhi.

D.Explain the difficulties of traveling in Delhi.小题2:What should you do to avoid being cheated when taking a taxi at the Delhi airport?

A.Go to a police-run booth.

B.Go out of the airport.

C.Show your ticket to the driver.

D.Pay more to the drivers to keep safe.小题3:The author suggests taking a rickshaw in order to ______.

A.save some money

B.gain some unique experience

C.enjoy the comfortable trip

D.help the local rickshaw drivers小题4:Which may be the topic that follows?

A.Car rentals in Delhi

B.Food and drink in Delhi

C.Weather conditions in Delhi

D.Hotel recommendations in Delhi

题型:选择题

下列说法正确的是(  )

①离子化合物一定含离子键,也可能含极性键或非极性键

②共价化合物一定含共价键,也可能含离子键

③含金属元素的化合物不一定是离子化合物

④由非金属元素组成的化合物一定是共价化合物

⑤由分子组成的物质中一定存在共价键

⑥熔融状态能导电的化合物一定是离子化合物.

A.①③⑤

B.②④⑥

C.②③④

D.①③⑥

题型:选择题

知识产权战略可分为两个不同的层次,包括()。

A.民族知识产权战略

B.国家知识产权战略

C.企业知识产权战略

D.产业知识产权战略

更多题库