多项选择题
A.灭菌锅真空泵的效力下降，造成冷空气排出不完全
B.灭菌锅的机械故障造成真空泵的抽气时间缩短
C.灭菌锅的密闭性下降，不能维持有效的真空状态
D.灭菌锅的抽真空过程受影响，没有达到绝对的真空状态
单项选择题 Sometimes I go to school（）car.
单项选择题 听力原文：W: Did you get the job you applied for?M: No. It's been offered to someone else, but I think it wouldn't have suited me anyway.Q: How does the man probably feel?(2)A．Worried.B．Unhappy.C．Pleasant.D．It's OK.
多项选择题 三级医院消毒供应中心，由省卫生厅组织考核合格后，颁发《医院消毒供应中心合格证》，题中错误的有效期是（）年