【单选题】【消耗次数：1】
( )不适合采用人工挖孔的施工方法。
①
无水的密实土层
②
少水的密实土层
③
少水的岩层
④
少水的砂层
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【单选题】
对长径比较小（一般小于10），桩身穿越软弱土层，桩端设置于密实砂层、碎石类土层、中等风化及微风化岩层中的桩，可视为（ ）。
①
端承桩
②
摩擦桩
③
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端承摩擦桩
【单选题】
由于幼儿的肌肉中水分多，蛋白质及糖原少，不适合他们的运动项目是( )。
①
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②
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③
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④
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