图示结构中,杆AB上截面C的弯矩绝对值为( )。[img=849x518]1803dac865250ec.jpg[/img] A: Fl/2 B: Fl/3 C: Fl/4 D: Fl/5
图示结构中,杆AB上截面C的弯矩绝对值为( )。[img=849x518]1803dac865250ec.jpg[/img] A: Fl/2 B: Fl/3 C: Fl/4 D: Fl/5
图示的力分别在x、y、z三轴上的投影为() A: X=2√2P/5,Y=3√2P/10,Z=√2P/2 B: X=2√2P/5,Y=-3√2P/10,Z=-√2P/2 C: X=-2√2P/5,Y=3√2P/10,Z=√2P/2 D: X=-2√2P/5,Y=-3√2P/10,Z=√2P/2
图示的力分别在x、y、z三轴上的投影为() A: X=2√2P/5,Y=3√2P/10,Z=√2P/2 B: X=2√2P/5,Y=-3√2P/10,Z=-√2P/2 C: X=-2√2P/5,Y=3√2P/10,Z=√2P/2 D: X=-2√2P/5,Y=-3√2P/10,Z=√2P/2
x=2,y=5,z=3 (x>y)+z*4=?
x=2,y=5,z=3 (x>y)+z*4=?
执行以下语句的结果:dict1={"x":1,"y":2,"z":3}dict2={"x":4,"a":5}dict1.update(dict2) A: {"x":1,"y":2,"z":3,"x":4,"a":5} B: {"x":4,"a":5,"x":1,"y":2,"z":3} C: 有重复项,结果有误! D: {"x":4,"y":2,"z":3,"a":5}
执行以下语句的结果:dict1={"x":1,"y":2,"z":3}dict2={"x":4,"a":5}dict1.update(dict2) A: {"x":1,"y":2,"z":3,"x":4,"a":5} B: {"x":4,"a":5,"x":1,"y":2,"z":3} C: 有重复项,结果有误! D: {"x":4,"y":2,"z":3,"a":5}
以下程序的输出结果是 def calu(x = 3, y = 2, z = 10): return(x ** y * z) h = 2 w = 3 print(calu(h,w))
以下程序的输出结果是 def calu(x = 3, y = 2, z = 10): return(x ** y * z) h = 2 w = 3 print(calu(h,w))
FLIPI将FL分为几个危险组?() A: 2 B: 3 C: 4 D: 5
FLIPI将FL分为几个危险组?() A: 2 B: 3 C: 4 D: 5
图示的力分别在x、y、z三轴上的投影为( )。[img=277x232]1786983f925fb81.png[/img] A: X=2Ö2P/5, Y=3Ö2P/10, Z=Ö2P/2 B: X=2Ö2P/5, Y= - 3Ö2P/10, Z= - Ö2P/2 C: X= - 2Ö2P/5, Y=3Ö2P/10, Z=Ö2P/2 D: X= - 2Ö2P/5, Y= - 3Ö2P/10, Z=Ö2P/2
图示的力分别在x、y、z三轴上的投影为( )。[img=277x232]1786983f925fb81.png[/img] A: X=2Ö2P/5, Y=3Ö2P/10, Z=Ö2P/2 B: X=2Ö2P/5, Y= - 3Ö2P/10, Z= - Ö2P/2 C: X= - 2Ö2P/5, Y=3Ö2P/10, Z=Ö2P/2 D: X= - 2Ö2P/5, Y= - 3Ö2P/10, Z=Ö2P/2
图示的力分别在x、y、z三轴上的投影为( )[img=260x229]1786983fb13c0a2.png[/img] A: X= - 3Ö2P/10, Y= 2Ö2P/5, Z= - Ö2P/2 B: X= - 2Ö2P/5, Y= 3Ö2P/10, Z= - Ö2P/2 C: X= 3Ö2P/10, Y= - 2Ö2P/5, Z= - Ö2P/2 D: X= 2Ö2P/5, Y= 3Ö2P/10, Z= - Ö2P/2
图示的力分别在x、y、z三轴上的投影为( )[img=260x229]1786983fb13c0a2.png[/img] A: X= - 3Ö2P/10, Y= 2Ö2P/5, Z= - Ö2P/2 B: X= - 2Ö2P/5, Y= 3Ö2P/10, Z= - Ö2P/2 C: X= 3Ö2P/10, Y= - 2Ö2P/5, Z= - Ö2P/2 D: X= 2Ö2P/5, Y= 3Ö2P/10, Z= - Ö2P/2
一对标准圆柱齿轮传动,若大、小齿轮的材料和(或)热处理方法不同,则工作时两齿轮间的应力关系属于下列第 种。 A: σH1≠σH2,σFl ≠σF2,[σH]1=[ σH]2,[σF]1=[ σF]2 B: σH1=σH2,σFl ≠σF2,[σH]1 ≠[ σH]2,[σF]1 ≠[ σF]2 C: σH1≠σH2,σFl =σF2,[σH]1 ≠[σH]2,[σF]1 ≠[σF]2 D: σH1=σH2,σFl =σF2,[σH]1 ≠[ σH]2,[σF]1 ≠[σF]2
一对标准圆柱齿轮传动,若大、小齿轮的材料和(或)热处理方法不同,则工作时两齿轮间的应力关系属于下列第 种。 A: σH1≠σH2,σFl ≠σF2,[σH]1=[ σH]2,[σF]1=[ σF]2 B: σH1=σH2,σFl ≠σF2,[σH]1 ≠[ σH]2,[σF]1 ≠[ σF]2 C: σH1≠σH2,σFl =σF2,[σH]1 ≠[σH]2,[σF]1 ≠[σF]2 D: σH1=σH2,σFl =σF2,[σH]1 ≠[ σH]2,[σF]1 ≠[σF]2
设z的初值是3,求下列表达式运算后的z值。(1)z+=z (2)z-=2(3)z*=2*6 (4)z/=z+z (5)z+=z-=z*=z
设z的初值是3,求下列表达式运算后的z值。(1)z+=z (2)z-=2(3)z*=2*6 (4)z/=z+z (5)z+=z-=z*=z