冷轧带钢常见的缺陷有哪些？
参考答案：
冷轧带钢常见的缺陷有浪形、瓢曲、碎边、辊印、振颤纹、过酸洗、氧化铁皮、麻点、夹皮、起皮、凹坑、毛刺、导板印等。
There was nothing we could do that day ____ him down but _____ him in the house.
A．calm, lock
B．to calm, to lock
C．calming, locking
D．to calm, lock
实验证明，爆炸能量与岩石介质之间有（）种耦合关系。
A.1
B.2
C.3
D.4
