什么是电器的温升?
参考答案:
电器温度升高后,其本身温度与周围环境温度之差,称为温升。
________ seems to be a strong competition in China for senior high students to enter college or university.[ ]
A. It
B. There
C. What
D. That
酸碱滴定法可用于测定酸、碱以及()的物质。