【单选题】【消耗次数：1】
下列构件的支座或联接处的约束，实际工程中，可简化为固定端约束的是（ ）。
①
阳台挑梁的支座处
②
简支梁的两端支座
③
外伸梁的两边支座
④
脚手架上两钢管用碗扣式联连处
参考答案：
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