图示桁架中，1、2、3、4杆的内力为：[img=306x161]17e0adda71c66b3.jpg[/img]
A: FN1 = FN2 = 0，FN3 = FN4不等于0
B: FN1 = FN2不等于0，FN3 = FN4 = 0
C: FN1 = FN2不等于0，FN3 = FN4 不等于0
D: FN1 = FN2 = FN3 = FN4 = 0
A: FN1 = FN2 = 0，FN3 = FN4不等于0
B: FN1 = FN2不等于0，FN3 = FN4 = 0
C: FN1 = FN2不等于0，FN3 = FN4 不等于0
D: FN1 = FN2 = FN3 = FN4 = 0
举一反三
- 图示对称桁架在正对称荷载作用下，杆1、2、3、4的内力为：( )[img=363x216]17e4440a1f6e057.png[/img] A: FN1 = FN2 = 0，FN3 = FN4≠0 B: FN1 = FN2≠0，FN3 = FN4 = 0 C: FN1 = FN2≠0，FN3 = FN4≠0 D: FN1 = FN2 = FN3 = FN4 = 0
- 图示桁架中，1、2、3杆的内力为：[img=248x145]17e0adda57e67e9.jpg[/img] A: FN1 = FN2 = FN3 = 0 B: FN1 = FN2 = FN3 均不等于0 C: FN1 = FN3 =0，FN2 不等于0 D: FN2 =0，FN1 = FN3不等于0
- 【单选题】2 .图示对称桁架在反对称荷载作用下,杆 1 、 2 、 3 的内力为: () A. FN1=FN2=FN3=0 ; B. FN1=FN2=FN3 ≠ 0 ; C. FN1= FN3=0 , FN2 ≠ 0 ; D. FN1=FN3 ≠ 0 , FN2=0 A. FN1=FN2=FN3=0 ； B. FN1=FN2=FN3 ≠ 0 C. FN1= FN3=0 ， FN2 ≠ 0 D. FN1=FN3 ≠ 0 ， FN2=0
- 图示对称桁架在反对称荷载作用下,杆1、2、3的内力为: A: FN1=FN2=FN3=0 B: FN1=FN2=FN3≠0 C: FN1=FN3=0，FN2≠0 D: FN1=FN3≠0，FN2=0
- 图示对称结构EI=常数，中点截面C及AB杆内力应满足：（ ）<img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201811/8e9516cd08c149dc83cbd9f1cb580008.jpg"/> A: M＝0，FQ 不等于0，FN =0，FNAB＝0 B: M不等于0，FQ=0，FN =0，FNAB＝0 C: M＝0，FQ不等于0， FN =0，FNAB 不等于0 D: M不等于0， FQ=0，FN =0，FNAB不等于0