is more important is      as the earth cooled down, water began to appear on its surface.

A．What /that

B．That/what

C．What / what

D．That / that

系统验收所需资料包括（）。

A.竣工验收申请报告

B.主要材料、设备、成品的出厂质量合格证明及进场检（试）验报告

C.风管（道）试验记录

D.安全和功能检验资料的核查记录

E.质量保修书