若在t秒内通过导体横截面的电量是Q,则电流强度I为( )。
A.I=Qt
B.I=t/Q
C.I=Q
D.I=Q/t
参考答案:B
在如图所示的电路中,要使电阻R1、R2串联,则应该
A.开关S1、S2均断开
B.开关S1、S2均闭合
C.只要断开开关S1
D.闭合开关S2、断开开关S1
It was between 1830 and 1835________the modern newspaper was born.[ ]
A.what
B.which
C.because
D.that