He studied hard and later became a well-known writer, ____ his father expected.

A．that was what

B．what was that

C．and which was

D．which was what

实验桌上有如下器材：天平一架、刻度尺一把、足够深的大水槽一个、底面积为S的细长平底试管一支、足量的水与细沙、小汤匙一个．要求从实验桌上选择适当的器材，设计一个实验证明：“当水的密度保持不变时，水内部的压强与水的深度成正比．”请写出实验步骤并画出实验数据记录表．