6.0mm盘条的许用拉力是（）。 A.3.98kN B.4.73kN C.5.56k

Mother's Day is a holiday for mothers. It is celebrated (庆祝) in the United States, English, India and some other countries. In a short time, it becomes widely celebrated. Mother's Day falls on the second Sunday in May. On that day, many people send gifts (礼物) of love to their mothers. Those whose mothers are still living often wear a pink (粉红色) or red rose (玫瑰) or carnation (康乃馨花) , while those whose mothers are dead wear a white one. The idea of a day for mothers was first given by Miss Anna Jarvis of Philadelphia. As a result of her hard work, the celebration of the first American Mother's Day was held in Philadelphia on May 10,1908. Soon the holiday became popular all over the country and around the world.

In China, people do the same on the day for mothers. And , in some cities, people sometimes ask a song to be broadcast (广播) for his or her mother only. This might cost a little money for some of them, but, as it is said, "Love is invaluable."

On May 8,1999, just the day before the Mother's Day this year, a Chinese mother was killed in criminal bombing (罪恶轰炸).Her name is Shao Yunhuan , a heroic (英雄的) mother. All the Chinese will remember her for ever.

小题1:Mother's Day ______.

A．is a holiday for mothers

B．is celebrated in the United Stated only

C．falls on May 10 every year

D．was given by Miss Anna Jarvis小题2:What was the date of the Mother's Day this year?

A．May 7,1999.

B．May 8,1999.

C．May 9,1999.

D．May 10,1999.小题3:On Mother's Day, people ______.

A．send some flowers to their mothers

B．wear a pink or red rose or carnation

C．wear a white flower

D．send gifts of love to their mothers小题4:"Love is invaluable. "Here the word "invaluable" means "______".

A．美好的

B．无价的

C．永恒的

D．无私的小题5:You've known the criminal bombing, which of the following ideas do you agree to?

A．Shao Yunhuan is a heroic mother.

B．She was born in America.

C．She was killed on May 9,1999.

D．All of the above.

　The students were having their chemistry（化学）class. Miss Li was telling the children what water was like. After that, she asked her students, “What's water ?”No one spoke for a few minutes．Miss Li asked again，“Why don't you answer my question？Didn't I tell you what water is like？”

Just then a boy put up his hand and said，“Miss Li，you told us that water has no color and no smell．But where to find such kind of water？The water in the river behind my house is always black and it has a bad smell．”Most of the children agreed with him．

“I'm sorry，children．”said the teacher，“Our water is getting dirtier and dirtier．That's a problem．

小题1:The students were having their _______ class．

A．English

B．Chinese

C．chemistry

D．maths小题2:Miss Li was telling the children what ______ was like．

A．water

B．air

C．earth

D．weather小题3:A boy said，“The water in the river behind my house is always _______．”

A．white

B．black

C．clean

D．clear小题4:Most of the children _______ the boy．

A．agreed with

B．wrote to

C．heard from

D．sent for小题5:The water in the river has color and smell because it is getting _______．

A．more and more

B．less and less

C．cleaner and cleaner

D．dirtier and dirtier

如图所示，一个物体在恒力F的作用下，沿光滑水平面运动，F与水平面的夹角为θ，在物体通过距离s的过程中（　　）

A．力F对物体做的功为Fs

B．力F对物体做的功为Fscosθ

C．物体动能的变化量为Fs

D．物体动能的变化量为0

引起筒式干燥设备出料温度波动的原因可能是，来料（）、水份、温度波动。