搜题
王老师:19139051760(拨打)
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第1题

被3除所得的余数为
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第2题

同余方程ax+b≡0(modm)有解的充分必要条件是
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第3题

The zoo keeper is worried because the number of visitors _____ smaller and smaller. A.become B.became C.is b
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第4题

If you try to sit on two chairs，you will fall _____ them. For life, you must choose one chair． A.between B.under C.am
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