合适的出钢温度T=Tf+ΔT1+ΔT2+ΔT3，其中Tf是指钢水的（）。
A.开浇温度
B.凝固温度
C.过热度
D.过冷度
参考答案：B
The book tells stories of the earthquake through the eyes of those _______ lives were affected.
A．who
B．that
C．whose
D．which
Internet的通信协议主要采用( ).
