圆管紊流粗糙区的沿程摩阻系数λ( )。 A．与Re和管长ι有关 B．与管壁相对粗

()是会计电算化成功的关键，在准备替代手工记账之前必须完成会计电算化岗位人员的配置和培训。

A.人才

B.硬件

C.软件

D.以上全部

The little boy      __  the river.  Luckily,  He was saved.               [ ]

A.  fall into        

B.  fell into        

C.  fall down      

D.  fell down

等腰直角三角形中，若斜边与斜边上的高的和是18cm，则斜边长为______cm．

Complete the sentences with the given words in their proper forms（用括号中所给单词的适当形式完成下列句子)  。

1. The students took the PISA test in _____subjects - reading, maths and science. (third)

2. Board games are more and more popular among _____. (teenager)

3. I liked to walk in fields on _____days and to see my footprints left behind. (snow)

4. _____people often begin their conversations by talking about the weather. (Britain)

5. The news about education has attracted the public attention _____. (recent)

6. The World Chocolate Park showed a_____of many kinds of chocolates. (collect)

7. To improve your writing skills, you'd better _____a habit of reading. (development)

8. Don't tell lies. Nobody likes those _____people. (honest)

一般纳税人提供管道运输服务，对其增值税实际税负超过3%的部分实行增值税先征后返政策。