无土栽培有什么特点?在技术上有何要求?

题型:问答题 简答题

问题:

无土栽培有什么特点?在技术上有何要求?

考点:高级中学语文无土栽培无土栽培题库
题型:问答题 简答题

阅读理解 阅读下面短文,从每题A、B、C、D 四个选项中,选出一个能回答所提问题或完成所给句子的最佳答案。

The City Mouse and the Country Mouse

Once there were two mice. They were friends. One mouse lived in the country; the other mouse lived in the city. After many years the Country mouse saw the City mouse; he said, "Do come and see me at my house in the country." So the City mouse went. The City mouse said, "This food is not good, and your house is not good. Why do you live in a hole in the field? You should come and live in the city. You would live in a nice house made of stone. You would have nice food to eat. You must come and see me at my house in the city."

The Country mouse went to the house of the City mouse. It was a very good house. Nice food was set ready for them to eat. But just as they began to eat they heard a great noise. The City mouse cried, "Run! Run! The cat is coming!" They ran away quickly and hid.

After some time they came out. When they came out, the Country mouse said, "I do not like living in the city. I like living in my hole in the field. For it is nicer to be poor and happy, than to be rich and afraid."

小题1: The story is about ____________.

A.two mice

B.two cities

C.two countries

D.A mouse and a cat小题2:The City mouse lives in ____________.

A.a hole

B.a house made of wood

C.a house made of stone

D.the field小题3:The great noise came from ____________.

A.the cat

B.the Country mouse

C.the City mouse

D.the house小题4: The mice were caught by the cat, weren’t they?

A.Yes, they were.

B.No, they weren’t.

C.They ran away and hid.

D.We don’t know.小题5: Which of the following is True?

A.The two mice lived together.

B.The two mice had a great meal.

C.The Country mouse had a poor life while the City mouse had a happy life.

D.The Country mouse had a poorer but happier life than the City mouse.

题型:问答题 简答题

一列简谐波沿波的传播方向先后有相距6米的A、B两点,A靠近波源,且A、B间距离小于该波3倍波长.当A点位移达到正向最大时,B点的位移恰好为零,且向正向运动.经0.5s(小于该波的4倍周期)后,A点位移恰好为零,且沿正向运动,而B点的位移恰好达到负的最大.则这列波的波速(  )

A.最小值是3m/s

B.最小值是4m/s

C.最大值是36m/s

D.最大值是204m/s

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