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桩产生负摩阻力时，下列说法中正确的是      。
A、桩身轴力沿深度逐步衰减
B、桩身沉降沿深度逐步衰减
C、单桩极限承载力由桩周土总侧阻力和桩端阻力所组成
D、采用涂层法措施后，可使桩身负摩阻力、沉降减小，但中性点深度变大

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