The nurse is interviewing a client who is currently under the influence of a controlled substance and shows signs of becoming agitated. Which measure should the nurse take first when caring for this client

A. Be aware of hospital security.
B. Communicate a scolding attitude to intimidate the client.
C. Use confrontation.
D. Express disgust with the client’s behavior.

高速铁路正线接触网支柱侧面限界，在一般路基区段应不小于（）米。