烤瓷合金中哪种金属含量过高可能导致瓷修复体变色
A．金B．银C．铜D．铁E．钴
参考答案：B
判断正(√)误(×)，把错的改正过来。
( ) 1. I had fun yesterday. ________________
( ) 2. I was happy now. ________________
( ) 3. He eats a sandwich everyday. ________________
( ) 4. Do you go shopping yesterday? ________________
( ) 5. Jenny miss her mother in Beijing. ________________
低压为0.4kV变电所中单台变压器的容量不宜大于( )。
A．800kVA
B．1000kVA
C．1250kVA
D．1600kVA
