加氢装置开工过程中，当炉出口温度达到（）℃时，需要对高温设备进行热紧。
A、150
B、200
C、250
D、300
参考答案：C
In the 1930s, the two countries were at ______ war, and his father was fighting at _____ front.
A．the; 不填
B．不填; the
C．the; the
D．不填;不填
有头疽最常见的并发症是：（）
A.走黄
B.内陷
C.流注
D.损骨
E.伤筋
