连铸操作中钢包采用吹氩的长水口保护浇注的主要作用（）
A.减少温度损失
B.使中间包钢水温度、成份均匀
C.防止二次氧化
D.降温
参考答案：C
当一个人觉得自己很优秀，看不起别人时，你会告诉他[ ]
A．有志者事竟成
B．尺有所短，寸有所长
It was not until dark __________ he found __________he thought was the correct way to solve the problem．
A．that; what
B．that; that
C．when; what
D．when; that
