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- 3已知a>b,c>d,且c、d不为0,则不等式成立的是:A:ad>bc B:ac>bd C:a-c>b-d D:a+c>b+d
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- 7如图,已知AB∥DC,AE⊥DC,AE=12,BD=15,AC=20,则梯形ABCD的面积是( ) A.140 B.130 C.160 D.150
- 8“你最难忘的经历”可不可以说What's the most unforgettable experience you had been?
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