某施工单位承建了某海港的5万t级重力式码头水下挖泥施工。

规范对基槽开挖有什么强制性要求？

What is learned in books cannot have the same deep effect _____ a child’s character as what is learned _____ experience.

A．on, in

B．on, by

C．in, by

D．by, with