（）为平面控制网的精度指标。

下列会计分录中，属于复合会计分录的是( )。

A．借：生产成本—A产品 30000
贷：原材料—甲材料 10000
—乙材料 20000
B．借：制造费用—办公费 300
—邮电费 600
贷：库存现金 900
C．借：制造费用—折旧费 2000
管理费用—折旧费 1000
贷：累计折旧 3000
D．借：银行存款 100000
贷：应收账款—A公司 40000
—B公司 60000

What picture do you have of the future? Will life in the future be better, worse or the same as now? What do you hope for about the future? Scientists think that life will probably be very different in 2050.

First of all, it seems that people won't use TV channels(频道) by 2050. Instead, people will choose a program from a “menu" and a computer will send the program directly to the television.

Water will become a very serious problem. We'll need much more water, but there won't be enough. Some scientists think that water would be the cause of war(战争).

Cars will run on new, clean energy and they will go very fast. And there won't be any accidents with the help of computers. On the other hand, space planes will take people around the world in two hours.

Robots will work in factories instead of people. Many factories have already used robots. Big companies prefer robots--they do not ask for money, and they work for 24 hours a day...

In a word, by 2050, our life will change a lot and our future will be quite different from now.

根据短文内容，判断以下句子的正误。你认为正确的句子，请在答题卷相应空格内写

“T”，错误的写“F”。(共5小题，每小题l分，满分5分)

小题1:Maybe people won't use TV channels any more by 2050.

小题2:There will be a lot of car accidents by 2050.

小题3:Water could be the cause of war.

小题4:Robots will work in big companies and ask for money.

小题5:According to the passage, our life in the future will be better.

你留意过下列事实吗？如：划船时桨向后滑水，船才会向前行使；溜旱冰时，相对静止的两个人，只要一人用力去推对方，两人会向相反方向运动；吹足了气的气球松开放手，球内气体从气嘴泄出的同时，气球会向相反方向运动，请归纳上述现象所共同遵循的物理概念或规律。

（1）                                                  。（2 ）                                               。

电流表串联安装在发电机与蓄电池之间，电压表与发电机并联。

根据无线电频率划分，3——30MHz频段应属于（）通信。

A.短波

B.超短波

C.中波

D.长波