【简答题】用方框中所给词的适当形式填空 health; say; have; get; keep; habit; risk; should; be c ause; at Health is very importan t lo us. To slay 1 . , we need some knowledge. Firstly, pay attention to the...
【简答题】The circuit is shown in the figure, the value of the resistor RL is variable. When the resisitor RL equals to ___Ω , the maximum power that the load RL can get should be equal to ________W. If the va...