【单选题】【消耗次数：1】
在汽车制动时，如果后轮抱死，就会出现以下现象：
①
迎面撞车
②
甩尾
③
翻车
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前后轮制动器制动力具有固定比值的汽车制动时，若前轮先抱死，在后轮没有抱死前，随着制动踏板里的进一步增加，后轮地面制动力会_________。
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汽车在制动过程中，当制动器制动力大于轮胎－道路附着力时，车轮就会抱死滑移。只有汽车具有足够的制动器制动力，同时地面又能提供较大的附着力时，汽车才能获得较好的制动效果。
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【简答题】
简述前轮先抱死拖滑、后轮先抱死拖滑及前后轮同时抱死拖滑三种制动情况下的汽车运行状况及附着条件利用情况。 （6分）
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