有关终点控制，下列说法正确的是（）。

A:终点控制实际上是指终点成分和温度的控制 B:终点控制实际上是指终点氧含量和温度的控制 C:终点控制实际上是指终点成分和钢水氧含量的控制

判断吹炼终点基本条件是终点碳、终点磷硫和终点温度三要素。

转炉的终点控制操作是指终点（）和终点（）的控制。

求每个终点的平均票价的SQL语句是

A:SELECT终点，avg (票价) FROM ticket GROUP BY 票价 B:SELECT终点，avg (票价) FROM ticket ORDER BY 票价 C:SELECT终点，avg (票价) FROM ticket ORDER BY 终点 D:SELECT终点，avg (票价) FROM ticket GROUP BY 终点

求每个终点的平均票价的SQL语句是

A:SELECT终点，avg(票价)FROM ticket GROUP BY票价 B:SELECT终点，avg(票价)FROM ticket ORDER BY票价 C:SELECT终点，avg(票价)FROM ticket ORDER BY终点 D:SELECT终点，avg(票价)FROM ticket GROUP BY终点

求每个终点的平均票价的SQL语句是

A:SELECT终点，avg (票价) FROM ticket GROUP BY 票价 B:SELECT终点，avg (票价) FROM ticket ORDER BY 票价 C:SELECT终点，avg (票价) FROM ticket ORDER BY 终点 D:SELECT终点，avg (票价) FROM ticket GROUP BY 终点

求每个终点的平均票价的SQL语句是：

A:SELECT终点，avg (票价) FROM ticket GROUP BY 票价 B:SELECT终点，avg (票价) FROM ticket ORDER BY 票价 C:SELECT终点，avg (票价) FROM ticket ORDER BY 终点 D:SELECT终点，avg (票价) FROM ticket GROUP BY 终点