钢水温度过高会加剧钢水的二次氧化。
参考答案：对
—I have got a headache.
—No wonder.You___in front of that computer too long.
A．work
B．are working
C．have been working
D．worked
抹灰用的石灰膏的熟化期不应少于( )。
A．10天
B．5天
C．15天
D．20天
