在使用玻璃电极测定溶液的pH时,如果玻璃电极是新的或者是放置很长一段时间没有被使用,为什么必须放在蒸馏水中浸泡24h后才能被使用?
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According to the assumption given in the last paragraph, we don’t exactly know________________________.
It seems that the author disagrees to explain________________________.
久病,舌淡而痿,为()
A. 热灼津伤
B. 阴亏已极
C. 气血俱虚
D. 气滞血瘀
__________________(还要更长时间) before you graduate from college