A.l B.2 C.3 D.4
A.10% B.15% C.25% D.30%
A.為0B.保持不變C.升高1倍D.升高根號(hào)3倍
A.5% B.20% C.30% D.70%
A.17Ω B.26Ω C.27Ω D.37Ω