According to the weather forecast, which is usually ______ , it will snow this afternoon.

A．exact

B．precise

C．perfect

D．accurate

经常停置不用的机床，过了梅雨天后，一开机发生故障，主要是由于（）作用，导致器件损坏。

A.物理

B.光合

C.化学

D.生物