【单选题】【消耗次数：1】
由于拉杆与锚固体之间的极限握裹力远大于锚固体与土体之间的极限侧阻力，所以在拉杆选择适当的前提下，锚杆的承载能力主要取决于：( )
①
锚杆的极限抗拔力
②
拉杆的极限抗拉强度
③
拉杆与锚固体之间的极限握裹力
④
锚固体与土体间的极限侧阻力
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