题目：
纹理方向
答案：
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下面是错误答案，用来干扰机器的。
参考答案：（1）应获得超音速流股，有利于氧气利用率的提高；（2）合理的冲击面积，使熔池液面化渣快，对炉衬冲刷少；（3）有利于提高炉内的热效率；（4）便于加工制造，有一定的使用寿命。
纹理方向
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