2.0SIR2.0SIRSIR2.0SIRSIRSIRSIRGSIRSIR2.02.02.0SIRSIR2.0SIR2.0SIR2.0SIRSIR2.0SIR2.0SIR2.0SIR2.0SIR2.0SIR2.02.0SIR2.0SIR2.0SIR2.0SIR2.0SIR2.0SIR2.0SIR2.0SIR2.0SIR2.0SIR2.02.0549（）