管道长度不变,管中流动为层流,允许的水头损失不变,当直径变为原来2倍时,若不计局部损失,流量将变为原来的多少倍?()
A.2
B.4
C.8
D.16
参考答案:D
解析:
根据短文内容回答问题。
Here is a picture of my family. In this picture, I'm doing my homework. My father is watching TV. My
grandfather is reading the newspaper. My grandmother is talking to my mother. And my sister is eating.
1. How many people are there in the picture?
2. What is my grandfather doing?
3. Is my sister singing?
4. Is my father watching TV?
5. What am I doing?
()因打印问题,暂时不允许挂入理财卡。
A.整存整取
B.零存整取
C.教育储蓄
D.通知存款