绝缘老化
参考答案:
绝缘老化是指绝缘材料长时间在高温下,材料本身发生分子结构的变化,颜色变深,机械性能变脆,机械强度大大降低,在力的作用下,极易破碎而导致失去绝缘作用。
The fire spread through the hotel very quickly, but everyone _____ get out. [ ]
A. would
B. could
C. should
D. was able to
简述非水溶液滴定法的一般方法。当供试品为氢卤酸盐时,为什么应加醋酸汞的冰醋酸溶液?