A pumproom is suspected of accumulating gases after a ventilation machinery breakdown. Where should the combustible gas indicator case be placed when testing the pumproom atmosphere for combustible gases?（）.

A.In the lower level of the pumproom

B.In the middle level of the pumproom

C.In the upper level of the pumproom

D.On the deck outside the pumproom

持续性、不安性、行动性是何种情绪、情感状态的特点？（）

A、心境

B、焦虑

C、激情

D、热情