Jim and Mary were both patiences in a Mental Hospital. One day because they were walking by the hospital swimming pool, Jim suddenly jumped into the deep end. He sank to the bottom. Mary promptly, jumped in save him. She swam to the bottom and pulled Jim out.

When the medical director became aware at Mary heroic act he immediately reviewed her file and called her into his office. “Mary, I have a good news and bad news. The good news is you’re being discharged because since you were able to jump in and save the life of other patient, I think you’ve regained your senses. The bad news is Jim, the patient you saved him, hung himself with his bathrobe belt in the bathroom, he is died.”

Mary replied, “He didn’t hang himself, I hang him up to dry.”

设备检修分为计划检修（含节日检修）和临时检修（含事故检修）。