【多选题】【消耗次数：1】
验算可能产生负摩阻力桩的单桩承载能力时，下列说法正确定的是（）。
①
桩侧摩阻力取整个桩长范围内的侧阻力之和；
②
负摩阻力应作为外荷载加以考虑；
③
桩侧摩阻力只计中性点以下桩段的侧摩阻力之和；
④
取中性点处作为验算截面；
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