炉子大凉时，炉前操作应迅速打开渣口放渣，严防烧穿。
参考答案：对
16时用普通计时法应是______时，晚上9时用24时计时法表示是______时．
I knew that________ would ever discourage him；he would never give up wanting to be a director．[ ]
A．something
B．anything
C．everything
D．nothing
