【单选题】【消耗次数：1】
Theres something ___________ going on.
①
mystery
②
myth
③
mysterious
④
maths
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随机题目
【单选题】
下列结论中哪些是正确的是（）。(1)杆件的某个横截面上，若轴力N=0，則各点的正应力σ也为零（既σ=0）。(2)杆件的某个横截面上，若各点的正应力σ均为零（既σ=0），則轴力必为零（既N=0）。(3)杆件的某个横截面上，若各点的正应力σ均为零（既σ=0），則弯矩必为零（既M=0）。
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