4#余热炉遭遇突然一趟电源停电,怎样应对?
参考答案:
(1)立即到配电室断开已停电的进线开关,合母联开关,启动设备;
(2)同时报告车间、通知维修电工处理。
—How long have you been studying in No. 8 Middle School?
—More than two years.
—So it will be less than one year you graduate from it.
A.when
B.before
C.after
D.since
制冷剂在蒸发器内蒸发过程中,()温度始终保持不变。