18.P1(x1,y1),P2(x2,y2)是函数y=$\frac{1}{2}$x图象上的两点,则下列判断中正确的是( )
| A. | y1>y2 | B. | y1<y2 | C. | 当x1<x2时,y1>y2 | D. | 当x1<x2时,y1<y2 |
17.
如图,AB∥ED,CD=BF,若△ABC≌△EDF,则还需要补充的条件可以是( )
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| A. | AC=EF | B. | BC=DF | C. | AB=DE | D. | ∠B=∠E |