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【简答题】
车辆型式分为()、()和()三种,由两个单元编组而成
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【单选题】听力原文：M: I don't know what to do with my professor．This morning we found him sleeping in his office． W: Don't be so hard on him．He's probably just weary． Q: What does the woman imply? (17)
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【简答题】代数式 ,当 时，它的值是7；当 时，它的值是4，试求 时代数式 的值。
【简答题】如果代数式 当 时的值是7，那么当 时该式的值是 。
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