Which nursing action takes priority when admitting a elient with right lower lobe pneumonia ？（）

A．Elevating the head of the bed 45 to 90 degrees.

B．Auscultating the chest for adventitious sounds.

C．Obtaining a sputum specimen for culture.

D．Notifying the physician of the client's admission.

保持集流环的碳刷与铜环表面的良好接触，是为了保证集流环的（）性能。

A、绝缘

B、导电

C、机械

D、旋转