反面焊接之前必须在铲根或气刨后（）以得到光洁无缺陷的焊面。 ["打磨根部","磁粉检验","清除未焊透","无损检验"]
根据学校的相关规定，（）考核未通过，不安排补考，应直接重做。 ["毕业论文","毕业设计","实践性教学","以上全是"]
A police officer claimed he had attempted to（）paying his fare. ["avoid","reject","refuse","neglect"]
主要适用于多种因素构成的综合性指标的分析，如成本、利润、资金周转等的分析方法是（）。 ["垂直分析法","综合分析法","趋势分析法","因素分析法"]
学生对某门课程所取得的成绩不满意时可以选择重新学习，该门课程的最终考试成绩将以（）分记入档案。 ["最高","平均","最低","最后一次得分"]
煤气脱焦油雾的目的？
