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【单选题】
设计紧螺栓连接时，其直径愈小，则安全系数应取得愈大，即应力取得愈小。这是由于直径愈小_________。A.
加工螺纹时愈容易产生缺陷
B.
螺纹部分的应力集中愈严重
C.
材料的机械性能愈不易保证
D.
拧紧时愈容易拧断
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