-- Look! Everything here is under construction.

--- What’s the pretty small house that ______ for?

A．is being built

B．has been built

C．is built

D．is building

由于转子平衡失效，找正情况不佳，以及油膜振荡等因素均会引起设备（）的增加。

A.摩擦

B.油膜

C.振幅

D.故障