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
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
D
举一反三
- 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
- 【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
- 斐波那契数列FN的定义为:F0=0,F1=1,FN=FN−1+FN−2,N=2,3,…。用递归函数计算FN的时间复杂度是O(N!)。
内容
- 0
下面程序的执行结果是: x=2 y=1 def fn(x): return x+y print(fn(4))
- 1
具有“合理拱轴”的静定拱结构的内力为()。 A: M=0,FQ≠0,FN≠0 B: M≠0,FQ=0,FN≠0 C: M=0,FQ=0,FN≠0 D: M≠0,FQ≠0,FN≠0
- 2
具有“合理拱轴”的静定拱结构的内力为: A: M=0,FS≠0,FN≠0 B: M≠0, FS =0, FN≠0 C: M=0,FS=0,FN≠0 D: M≠0,FS≠0,FN≠0
- 3
图示拉(压)杆1—1截面的轴力为( )。[img=357x73]17d6073a2429c60.png[/img] A: FN=2P B: FN=3P C: FN=6P D: FN=P
- 4
图示拉(压)杆1—1截面的轴力为()。 A: FN=6P B: FN=2P C: FN=3P D: FN=P