1.若在梁的中点施加一个集中力，则该点的弯矩最大值是？

A.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240111/1704959829318998.png">

B.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240111/1704959829341277.png">

C.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240111/1704959829400149.png">

D.<img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240111/1704959829417864.png">

A. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563392783681.jpeg">

B. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/1705563392834725.jpeg">

C. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/170556339287395.jpeg">

D. <img src="https://cg-service.oss-cn-shanghai.aliyuncs.com/20240118/170556339291996.jpeg">

A.1/2

B.1/4

C.1/16

D.1/32

A.12kNm

B.15kNm

C.18kNm

D.20kNm

A.支座处

B.跨中

C.四分之一跨处

D.三分之一跨处

A.减半

B.不变

C.增加一倍

D.增加两倍

A.10kN·m

B.20kN·m

C.30kN·m

D.40kN·m

A.P/L

B.PL/2

C.PL

D.P/L^2

A.因为跨中是最弱点

B.因为活荷载布置在目标跨及其相邻跨上

C.因为梁的长度

D.因为材料的性质