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6月1日起,我国将全面试行居民阶梯式电价,某市出台了实施细则,具体规定如下: 设...
6月1日起,我国将全面试行居民阶梯式电价,某市出台了实施细则,具体规定如下:
设用电量为a度,当a≤150时,电价为现行电价,每度0.51元;当150<a≤240时,在现行电价基础上,每度提高0.05元;当a>240时,在现行电价基础上,每度提高0.30元.设某户的月用电量为x(度),电费为y(元).
则y与x之间的函数关系的大致图象是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193831033952842/SYS201311011938310339528009_ST/images0.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193831033952842/SYS201311011938310339528009_ST/images1.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193831033952842/SYS201311011938310339528009_ST/images2.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193831033952842/SYS201311011938310339528009_ST/images3.png)
考点分析:
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193831033952842/SYS201311011938310339528005_ST/0.png)
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![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193831033952842/SYS201311011938310339528004_ST/images3.png)
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