A.12kN,拉杆 B.16kN,拉杆 C.20kN,拉杆 D.24kN,拉杆C

Loveyou2019-12-17  73

问题

选项 A.12kN,拉杆B.16kN,拉杆C.20kN,拉杆D.24kN,拉杆

答案C

解析[img]/upload/tiku/36/5277302_1.jpg[/img]
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