Translation of "Concrete" in Chinese

He was only bothered about concrete questions.

他一向只关心具体问题。

A committee should apply the focus to the more concrete problem.

委員會應該把注意力集中在更具體的問題上。

Great! Is the apartment bought as a concrete shell, or is it ready to move into?

太棒了！是毛坯房还是装修房？