下列城市工程管线,哪一种管线最宜采用环状管网布局形式( )
A.雨水管
B.污水管
C.热力管
D.给水管
参考答案:D
下面的情景对话你能应付吗?试试看。
1. 别人赞扬你的画很好,你应说: [ ]
A. Thank you.
B. Oh, no.
2. 想知道迷路孩子的家在哪儿时,应说:
[ ]
A. Where's your home?
B. What's your home?
3. 当你建议别人吃些苹果时,应说: [ ]
A. Would you like some apples?
B. Eat some apples.
4. 当你祝别人时,应说:
A. This is a good trip!
B. Have a good trip!
5.你想知道你朋友的膊怎么了,你应该问:[ ]
A. What happened for your arm?
B. What happened to your arm?
二次函数y=x2的图象向下平移2个单位,得到新图象的二次函数表达式是( )
A.y=x2-2
B.y=(x-2)2
C.y=x2+2
D.y=(x+2)2