2.0SIR2.0SIR2.02.02.0SIRSIRSIRSIRSIRSIRSIRSIR2.0SIR2.0SIR2.0SIRSIR2.0SIR2.0SIR2.0SIR2.0SIR2.02.0SIRSIR2.02.02.0SIRSIR2.0SIR2.0SIRSIRSIR2.02.0SIR2.0SIRSIR2.02.0SIR（）