模板及支撑支设时应符合的要求是( )。
A．位置正确
B．足够的强度、刚度和稳定性
C．施工方便、不漏浆
D．以上三项
参考答案：D
published fifty years ago, his work still attracts much attention at present.
A．As
B．Though
C．Apart from
D．Despite
表征超导体性能的三个主要指标是什么?
