The nurse is caring for a client who is suicidal. When accompanying the client to the bathroom, the nurse should （）.

A．give him privacy in the bathroom.

B．allow him to shave.

C．open the window and allow him to get some fresh air.

D．observe him.

下列哪种是生产过程中产生的物理因素( )

A．石棉尘
B．甲醇
C．高温
D．真菌