脱氢氰酸塔投入热源前，需确认的工作有（）等。

A、脱氢氰酸塔顶冷凝器盐水的投用情况

B、脱氢氰酸塔回流泵的状况

C、脱氢氰酸塔顶排汽冷凝器盐水的投用情况

D、醋酸的加入情况

Care of the soul is a gradual process ________ even the small details of life should be considered.                                                    (2012·湖南，34)

A．what

B．in what

C．which

D．in which