闭合电路的电流,与电源电动势成正比,与整个电路的电阻成反比。
参考答案:对
比较的大小,其中D:1≤x≤2,0≤y≤1,则()。
A.I1<I2
B.I1=I2
C.I1≤I2
D.无法比较
It seems that water from this tap ________ for some time.We'll have to take it apart to put it right.
A.had leaked
B.is leaking
C.leaked
D.has been leaking