正火能够代替中碳钢和低碳合金钢的退火，改善组织结构和切削加工性。
参考答案：对
He can play________basketball well, but he can't play________guitar.
A. the; / B. /; the C. the; the
任何单位或个人不得擅自更改检验检疫证书内容，伪造或变更检验检疫证书属于违法行为( )
