A.内存容量大小
B.软盘容量大小
C.显示器型号
D.CPU型号
计算{1,2,3,4,5,6}的排列i1i2i3i4i5i6的个数。其中
i1≠1,2,3 i2≠1 i3≠1 i5≠5,6 i6≠5,6
在图1.28中,已知I1=0.01μA,12=0.3μA,I5=9.61μA,试求电流I3、I4、I6。
A.i1 = (ua - ub)/R1=0.5A i2 = (uc - ub)/R2=-1.5A i3 = ub/R3=0.5A
B.i1 = (ua - ub)/R1=1A i2 = (uc - ub)/R2=-0.5A i3 = ub/R3=0.5A
C.i4 = (ua – uc)/R4=0.6A i5 =i1 + i4=1.6A i6 =i2 - i4= - 1.1A
D.i4 = (ua – uc)/R4=1.6A i5 =i1 + i4=1.2A i6 =i2 - i4= - 1.2A