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