1.在图中所示外伸梁B截面的弯矩值是多少？

A. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563392965943.jpeg">

B. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563392982483.jpeg">

C. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/170556339303245.jpeg">

D. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563393099145.jpeg">

A. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563393298642.jpeg">

B. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563393350945.jpeg">

C. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563393373630.jpeg">

D. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563393399873.png">

A.$-wL/2$

B.$-wL^2/2$

C.$wL^2/8$

D.$wL/4$

A.减半

B.不变

C.增加一倍

D.增加两倍

A.减半

B.不变

C.增加一倍

D.增加两倍

A.0

B.PL/4

C.PL/8

D.PL/2

A.80

B.500

C.420

D.580

A.弯矩是剪力的积分

B.剪力是弯矩的积分

C.剪力是弯矩的导数

D.弯矩和剪力没有直接关系

A.梁长

B.支座反力

C.荷载大小和位置

D.材料强度