What appear to be large windows in the second storey are glass heat collector.
哪是主句?主语补足语是哪个?麻烦帮我把句子成分划分一下啦,谢谢大家!
What are glass heat collector 是主句in the second storey是状语What appear to be large windows是主语从句appear是从句里的谓语to be large windows和appear 组成系表结构