问题
刚度验算中梁的挠度为______。A．6.9mmB．7.5mmC．7.8mmD．8.2mm
刚度验算中梁的挠度为______。
A．6.9mm
B．7.5mm
C．7.8mm
D．8.2mm
请帮忙给出正确答案和分析，谢谢！
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