The nurse is instructing an unlicensed assistant on how to collect a urine specimen from an indwelling catheter. Which of the following statements indicates that the assistant understands the instructions

A. "I will empty the catheter drainage bag, have the client drink some water, and an hour later collect the urine that drains into the bag. "
B. "I will get a sterile syringe and remove urine from the catheter through the collection port to place in the specimen container. "
C. "I should collect urine from the catheter drainage bag at the end of the shift and place it in the specimen container. "
D. "I will disconnect the drainage tube from the catheter and let urine run from the catheter into the specimen container. "

子天平显示“+E”时，主板有故障的修理方法是（）

A、检修电子天平的主板故障并排除

B、正确调整限位螺母位置

C、减少质量，保证在最大载荷内称量

D、检修或更换电子天平的加力线圈