精炼钢钙处理后净吹时间≥()分钟。
A.5
B.6
C.8
D.10
参考答案:C
(),there was no hope of her getting the order.
A.As she was exhausted
B.If she was exhausted
C.Exhausted though she was
D.Now that she was exhausted
简述安全操作系统的机制