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问题 名词解释

土壤基本的粒级有

答案

参考答案：石砾、砂粒、粉粒、黏粒（>0.01mm的称物理性砂粒，<0.01mm的称物理性黏粒。）

解答题
我们来看下面的两个例子：
(
9×4
)2=9×4，(
9
×
4
)2=(
9
)2×(
4
)2=9×4，
9×4
和
9
×
4
都是9×4的算术平方根，而9×4的算术平方根只有一个，
所以
9×4
=
9
×
4
．
(
5×7
)2=5×7，(
5
×
7
)2=(
5
)2×(
7
)2=5×7
5×7
和
5
×
7
都是5×7的算术平方根，
而5×7的算术平方根只有一个，所以______（填空）
（1）猜想：一般地，当a≥0，b≥0时，
ab
与
a
×
b
之间的大小关系是怎样的？
（2）运用以上结论，计算：
64×225
的值．
查看答案
阅读理解
阅读理解。
     Going to Disneyland is a dream vacation for kids. You may have been to the
Disney-land in Hong Kong Or in other places. Soon you will be able to enjoy a Disney
Park in Shanghai. Shanghai Disneyland started building on April 8, 2011. There will be
many Chinese characters in Shanghai Disneyland, It is different from the Others. There
is a 10-kilometer-long river. It goes around the whole park. Shanghai Disneyland will
cost 24. 4 billion yuan to build. It will open in five years.

     In order to keep the road safe, European Commission (欧盟) says that buses and
taxis can be fitted (安装) with "black boxes". The black boxes can help police to find
what happened after an accident.

     Some robots will soon be used to carry medical rubbish, pass, food and give out medicine at a UK hospital. The newest technology(技术) is already in hospitals in
Japan, the US and France.

     A village in eastern Germany doesn't have enough money to repair the holes in
the road. So they sell the holes to the people in the village. Each hole is $ 68. The
government will repair them with the money and put a message on top of each hole
to remember the buyers. It's a funny idea. Most buyers just want to do some good
things to the society. However, some TV stations and newspapers buy some holes
just to make more money from
1. Which of the following is TRUE to Shanghai Disneyland?
A. A 10-kilometer-long river goes in the middle of the park.
B. There will be many Chinese characters.
C. It is the same as the others.
D. It opened 5 years ago.
2. In order to keep the road safe, European Commission wants to ______.
A. make buses and taxis go slowly
B. fit buses and taxis with "black hones"
C. make the police find out what happened
D. find out what "black boxes" can do
3. The robots will ______  in a UK hospital.
A. carry medical rubbish
B. give out newspapers
C. cook dinner
D. water flowers
4. TV stations and newspapers buy the holes because ______.
A. the roads have been broken badly
B. they want to have their own holes
C. they want to make more money
D. the government doesn't have enough money
查看答案