单项选择题
A.4TN2B.1LN4C.OAD.CCU
A.1:1B.1+1C.M:ND.ODUk
A.16TN1B.UXU2C.1LN4D.OMU48
A.16TN1B.4TN2C.1TN3D.1TN4
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