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根据下列场景，回答第 46～50 题 某城市桥梁工程，在钻灌注桩的施工过程中，采用正循环回转钻原理，但在施工中发现浪费泥浆多。而且消耗动力快，钻进度慢，负责人决定换取另种钻灌注桩成方法。负责人还在钻灌注桩施工前，首先进行了护筒埋设工作，以保护壁免于坍塌。 第 46 题 反循环回转钻原理与正循环回转钻原理相比，具有（ ）等优点。
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