热值分析过程中,开机异常的原因包括()
A、恒温筒开关未打开
B、恒温筒水量偏低
C、保险丝断
D、电路系统故障
参考答案:A, C, D
Which factor would NOT be considered when you choose better residence
A.On-staff nurses.
B.Visiting practitioners.
C.Medication reminders.
D.Supportive seniors.
用狭平板钢板,螺旋卷成并焊接成截面为圆形,外径50cm的石油管道