普通电冰箱自动化霜装置如何控制停止化霜？
参考答案：
当蒸发器表面结霜融化后，箱内温度上升至13℃时，双金属片化霜温控器断开化霜电路接点停止化霜。
——Mr Smith looks rather a kind man.
——But in fact he is cold and hard on us. You ____ believe it!
A．shouldn't
B．wouldn't
C．mustn't
D．needn't
Not ____ he died, he received an award for his selfless service to the old. [ ]
A. long before
B. before long
C. long ago
D. shortly before
