微机保护通过A/D获得输入电压、电流的模拟量的过程称为()。
A. 多路转换
B. 光电隔离
C. 采样
D. 人机接口
物理性损伤包括____________________、____________________、____________________、____________________等。
Our factory is much more productive now. This year’s production is five times as much () it was ten years ago.
A. what
B. as
C. that
D. tha
计算题:分解器中一次装入精制钠10吨,含酚量20%,问完成分解需浓度98%的硫酸多少吨?