A.231000
B.200000
C.220000
D.210000
[单选题]A.零根B.2根C.4根D.6根
[单选题]A.牙冠的腭侧龈缘处B.中外1/3交界处C.外侧1/3D.内侧1/3E.中内1/3交界处
[判断题]A.对B.错
[单选题]A.3B.6C.9D.以上答案均不正确
[单选题]A.1ΩB.-1ΩC.2ΩD.-2Ω
[单选题]A.50mHB.75mHC.100mHD.125mH
[单选题]A.B.C.D.