技术要求换炉时高炉风温波动不大于（）°C。
A.50
B.60
C.70
参考答案：B
The actress who had been highly thought of ____ to be a great disappointment.[ ]
A. turned up
B. turned out
C. turned in
C. turned down
玻璃幕墙上的玻璃具有( )的作用。
A．围护
B．支撑
C．装饰
D．承重
E．透光
