【简答题】听下面一段材料,回答第1至3题. 1. What is the most probable relationship between the two speakers ? A. Guid and traveler B. Driver and passanger C. Assistant and customer 2. What season is it now according to the c...
【简答题】1.
What is the most basic quantity in an electric circuit? 2.
What is the feature of electric charge or electricity ? 3.
How is an electric current created? 4.
What is a DC? 5.
what is an DC? 6.
How d...