梁的横截面如图所示,其抗弯截面系数为( )。[img=570x649]1803b26364407c8.png[/img]
A: [img=96x46]1803b2636d25ef4.png[/img]
B: [img=96x46]1803b2637618822.png[/img]
C: [img=96x46]1803b2637f16724.png[/img]
D: [img=98x46]1803b263869695b.png[/img]
A: [img=96x46]1803b2636d25ef4.png[/img]
B: [img=96x46]1803b2637618822.png[/img]
C: [img=96x46]1803b2637f16724.png[/img]
D: [img=98x46]1803b263869695b.png[/img]
举一反三
- 梁的横截面如图所示,其抗弯截面系数为( )。[img=570x649]1803496a62b824c.png[/img] A: [img=96x46]1803496a6b3c352.png[/img] B: [img=96x46]1803496a736e4a7.png[/img] C: [img=96x46]1803496a7bd115b.png[/img] D: [img=98x46]1803496a85251b4.png[/img]
- 梁的横截面如图所示,其抗弯截面系数为( )。[img=570x649]1803496aaf2a542.png[/img] A: [img=96x46]1803496ab7c8747.png[/img] B: [img=96x46]1803496ac080b00.png[/img] C: [img=96x46]1803496ac9a1bfb.png[/img] D: [img=98x46]1803496ad20bbf8.png[/img]
- X~N(1,1), 密度函数为[img=37x25]18038fe689205b5.png[/img], 分布函数为F(x), 则( ) A: [img=198x25]18038fe690a03ee.png[/img] B: [img=101x25]18038fe69af96aa.png[/img] C: [img=67x25]18038fe6a3b8e5b.png[/img][img=118x25]18038fe6ab93d6f.png[/img] D: F(x)=F(-x)
- 令F(x):x是有理数,G(x):x是实数。将命题“所有的有理数都是实数,但有的有实数不是有理数”符号化为() 未知类型:{'options': ['17e0a83a4157352.jpgx(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)∧G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)∧[img=10x11]17e0a839b915354.jpg[/img]F(x))', ' [img=8x14]17e0a83a4157352.jpg[/img]x(F(x)[img=14x9]17e0a73094b5dcf.jpg[/img]G(x))∧[img=8x14]17e0a83a35505d4.jpg[/img]x(G(x)[img=14x9]17e0a73094b5dcf.jpg[/img][img=10x11]17e0a839b915354.jpg[/img]F(x))'], 'type': 102}
- 下列等值式中正确的是( )。 未知类型:{'options': ['( [img=8x14]17e4385a99bb660.jpg[/img]x)(P(x)→B) ≡ ([img=8x14]17e4385a99bb660.jpg[/img]x)P(x)→B', ' ( [img=8x14]17e4385aa223929.jpg[/img]x)(B→Q(x)) ≡B→([img=8x14]17e4385aa223929.jpg[/img]x)Q(x)', ' ( [img=8x14]17e4385aa223929.jpg[/img]x)(P(x)→B) ≡ ([img=8x14]17e4385aa223929.jpg[/img]x)P(x)→B', ' ( [img=8x14]17e4385aa223929.jpg[/img]x)(B→Q(x)) ≡B→ ([img=8x14]17e4385a99bb660.jpg[/img]x)Q(x)'], 'type': 102}