以下关于钻芯法说法正确的是：

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【单选题】【消耗次数：1】

以下关于钻芯法说法正确的是：

① 该方法直观、准确、但可靠度不高

② 该方法费用较高，但费时较少

③ 该方法对混凝土造成局部损伤，因而大量的钻芯取样往往受到限制

④ 钻芯法的检测结果可由其他无损方法推论，所以可以用其他方法代替钻芯法

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