A.
B.
C.
D.0
[单选题]A.252.4B.248.1C.154.3D.98.1
[单选题]A.58.8B.65.5C.68.8D.70.0
[单选题]A.8.000B.8.167C.11.760D.12.000
[单选题]A.8.000B.8.167C.11.760D.12.000
[单选题]A.58.8B.65.5C.68.8D.70.0
[单选题]A.IB=I2,VB=UBEB.I2=(5~10)IB,VB=(5~10)UBEC.
[单选题]A.IB=I2,VB=UBEB.I2=(5~10)IB,VB=(5~10)UBEC.