I shall never forget the days          I spent in Beijing University,          has a great effect on my life.

A．that; which

B．which; that

C．when; that

D．when; which

在一级检查保养中，应清洗发动机、变矩器、油散热器和（）的外表面，特别应注意风冷发动机的散热片、汽缸盖吹制散热片间通道的通畅和清洁。