按规范要求,渡槽侧墙顶部厚度不小于下列哪项
A. 70mm
B. 80mm
C. 90mm
D. 100mm
渡槽底板属于下列哪种受力构件
A. 受弯
B. 大偏心受压
C. 大偏心受拉
D. 小偏心受拉
Why is non-stop Internet connection becoming indispensable for the storage and management of the information? What is the advice offered by the writer?
遗传学的奠基人是()
A. 孟德尔
B. 盖伦
C. 希波克拉底
D. 达尔文