进户线的长度一般不超过()米,最长不超过()米。
A.6;10
B.5;8
C.4;7
D.6;8
参考答案:A
如图甲所示的电路,电源电压保持不变。闭合开关S,调节滑动变阻器,两电压表的示数随电路中电流变化的图线如图乙所示,根据图线的信息可知:____是电压表V2示数变化的图线,电源电压为_____V;电阻R1的阻值为____ 。
—Why didn’t you give back Robert’s e-dictionary yesterday?
—I forgot ______ it here, but I mean ______ it to him tomorrow.
A.to bring; to return
B.to bring; returning
C.bringing; to return
D.bringing; returning