开关柜设备在扩建时，必须考虑与原有开关柜的一致性。（）
参考答案：对
.--- I was lucky the win a gold medal in the800-metre race.
--- You ____ through hard training.
A．must go
B．should go
C．must have gone
D．should have gone.
灰铸铁冷焊时应注意什么？
