单项选择题

图示结构截面B的弯矩（设下侧受拉为正）为：

A．-20kN.m
B．-10kN.m
C．-6kN.m
D．-4kN.m

你可能感兴趣的试题

单项选择题

电子排布式为1s22s22p23s1的原子虽然不稳定，但可以存在。

A．对
B．错

单项选择题

Where were the Bronze Chariots and Horses unearthed?

A．20 meters west of the mount of Emperor Qin Shihuang’s mausoleum
B．Pit No. 1
C．Pit No. 2
D．Pit No. 3