如图,在竖直平面内由圆弧AB和圆弧BC组成的光滑固定轨道,两者在最低点B平滑连接。A

题型:问答题

问题:

如图,在竖直平面内由圆弧AB和圆弧BC组成的光滑固定轨道,两者在最低点B平滑连接。AB弧的半径为R,BC弧的半径为。一小球在A点正上方与A相距处由静止开始自由下落,经A点沿圆弧轨道运动。

(1)求小球在B、A两点的动能之比;

(2)通过计算判断小球能否沿轨道运动到C点。

考点:普通高考理科综合2016年高考理综生物全国统一卷3答案_2016年高考理综生物试题及答案
题型:问答题

Malls are popular places for Americans to go. Some people spend so much time at malls that they are called "mall rats". Mall rats shop until they drop in the hundreds of stores.

People like malls for many reasons. They feel safe because malls have police stations. Parking is usually free, and the weather inside is always fine. The newest malls have beautiful rest places with waterfalls and large green trees.

The largest mall in the United States is the mall of America in Minnesota. It covers 4.2 million square feet. It has 350 stores, eight nightclubs, and a large park! there are parking spaces for 12.750 cars. about 750,000 people shop there every week.

The first indoor mall in the United States was built in 1965 in Edina Minnesota. People love doing all their shopping in one place. More malls are built around the country. Now malls are like town centers where people ____________________. They shop, of course, they also eat in food courts(广场) that have food from all over the world. They see films at theaters. Some people even get their exercise by doing the new sport of "mall walking". Others go to malls to meet friends.

In some malls, people can see a doctor and even go to the church. In other words, people can do just about everything in malls. Now people can live in their favorite shopping center in fact.

小题1:Why do people like malls? (please answer within 10 words)

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小题2:What does “mall” mean here?

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小题3:Except shopping, what else can people do in the mall? (please answer within 30 words)

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小题4:Please fill in the blank in the fourth paragraph with proper words or phrases to complete the sentence. (please answer within 10 words)

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小题5:What is the best title of this passage?

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题型:问答题

下列癌中可以见到角化珠的是()。

A.分化好的鳞癌

B.分化差的鳞癌

C.分化差的腺癌

D.基底细胞癌

E.小细胞癌

题型:问答题

马达法辛烷值是表示发动机在()的转速运转时汽油的抗爆性能。

A、900r/min

B、800r/min

C、700r/min

D、600r/min

题型:问答题

使用抱汁芡进行增稠处理的菜肴是______。

A.油爆双脆

B.炸烹仔蟹

C.葱烧海参

D.松鼠鳜鱼

E.糟熘鱼片

F.茜胡醋鱼

题型:问答题

碳化焰不能用于焊接()。

A.低碳钢和低合金钢

B.中碳钢和中合金钢

C.高碳钢和高合金钢

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