最低共熔点
参考答案：
物料在加热过程中，由两种或两种以上组分开始出现液相的温度的点。
—Where's your dog, Jack?
—She _____ for two weeks. How I miss her! [ ]
A. died
B. has died
C. has been dead
D. was dying
第二次世界大战中，最大的坦克大会战是（）。
