听觉系统对相位失真相对敏感。 
A、正确
B、错误

A．Emptying the drainage bag every 8 hours or when half full.
B．Kinking the catheter tubing to obtain a urine specimen.
C．Placing the drainage bag on the side rail of the patient’s bed.
D．Failing to secure the catheter tubing to the patient’s thigh.