梁受力如图所示，梁的应变能为 [img=36x47]18034ce1caca733.png[/img]，此梁B截面的转角大小为（ ）[img=262x96]18034ce1d5bfde3.png[/img]
A: [img=31x44]18034ce1ddc9498.png[/img]
B: [img=31x44]18034ce1e637145.png[/img]
C: [img=31x44]18034ce1ef546d4.png[/img]
D: [img=40x44]18034ce1f7c3604.png[/img]
A: [img=31x44]18034ce1ddc9498.png[/img]
B: [img=31x44]18034ce1e637145.png[/img]
C: [img=31x44]18034ce1ef546d4.png[/img]
D: [img=40x44]18034ce1f7c3604.png[/img]
举一反三
- 原电池（-）Pt︱Fe[img=17x22]1803dd54de61136.png[/img](1 mol·L[img=17x22]1803dd54e7299c0.png[/img]),Fe[img=17x22]1803dd54f0030fb.png[/img](1 mol·L[img=17x22]1803dd54fa39c0d.png[/img])‖Ce[img=17x22]1803dd5502f9d6b.png[/img]( mol·L[img=17x22]1803dd550b82a7d.png[/img]) ,Ce[img=17x22]1803dd55130efd2.png[/img]( mol·L[img=17x22]1803dd551af174c.png[/img]) ︱Pt(+)的电池反应是( )。 A: Ce[img=17x22]1803dd552375aee.png[/img] + Fe[img=17x22]1803dd552ca7541.png[/img] = Ce[img=17x22]1803dd5534dbdef.png[/img] + Fe[img=17x22]1803dd553dc33d1.png[/img] B: Ce[img=17x22]1803dd552375aee.png[/img] + Fe[img=17x22]1803dd553dc33d1.png[/img] = Ce[img=17x22]1803dd5534dbdef.png[/img] + Fe[img=17x22]1803dd552ca7541.png[/img] C: Ce[img=17x22]1803dd5534dbdef.png[/img] + Fe[img=17x22]1803dd553dc33d1.png[/img] = Ce[img=17x22]1803dd552375aee.png[/img] + Fe[img=17x22]1803dd552ca7541.png[/img] D: Ce[img=17x22]1803dd5534dbdef.png[/img] + Fe[img=17x22]1803dd552ca7541.png[/img] = Ce[img=17x22]1803dd552375aee.png[/img] + Fe[img=17x22]1803dd553dc33d1.png[/img]
- 图示梁的抗弯刚度[img=22x19]1802d88a9c6c77a.png[/img]为常数，求右端支承弹簧刚度[img=10x19]1802d88aa58b54f.png[/img]的大小，使得C处挠转角为0 （ ）。 [img=1116x416]1802d88ab4e68b7.jpg[/img] A: [img=31x44]1802d88abe3851d.png[/img] B: [img=31x44]1802d88ac6f7ac7.png[/img] C: [img=40x44]1802d88acf306ba.png[/img] D: [img=40x44]1802d88ad739ce9.png[/img] E: [img=31x44]1802d88adf95693.png[/img]
- 1.设随机变量X的密度为[img=186x61]18034ea953ec9dd.png[/img]则常数A=________，概率[img=146x25]18034ea95d30d08.png[/img]__________. A: A=2，P(X>1|X<2)=[img=39x24]18034ea9659b618.png[/img] B: A=-2，P(X>1|X<2)=[img=39x24]18034ea9659b618.png[/img] C: A=2，P(X>1|X<2)=[img=47x44]18034ea9768a8c2.png[/img] D: A=-2，P(X>1|X<2)=[img=47x44]18034ea9768a8c2.png[/img]
- 设X与Y相互独立，均服从参数为1的指数分布，则P(X+Y<1) A: [img=84x24]18036de4b8088be.png[/img] B: [img=75x24]18036de4bf77b71.png[/img] C: [img=75x24]18036de4c8172a3.png[/img] D: =P(X<1)P(X<1) E: =P(X<0.5)+P(X<0.5) F: >P(X<1)
- 设X与Y相互独立，均服从参数为1的指数分布，则P(X+Y<1) A: [img=84x24]1803645ffb36da1.png[/img] B: [img=75x24]180364600306be0.png[/img] C: [img=75x24]180364600c8ab8b.png[/img] D: =P(X<1)P(X<1) E: =P(X<0.5)+P(X<0.5) F: >P(X<1)