颈部气管闭合性创伤症状可表现为（）
A.呼吸困难
B.声嘶
C.纵隔气肿
D.咳嗽，大出血
E.疼痛，可放射至同侧耳部
参考答案：A, B, C, D, E
—How do you deal with the disagreement between the company
and the customers?
—The key________ the problem is to meet the demand____
____by the customers?
A．to solving；making
B．to solving；made
C．to solve；making
D．to solve；made
小配方为石墨化块的生碎，可以加入下列哪几种产品中（）
A、Φ500电极
B、Φ275接头
C、标准糊
D、高炉块
