把a=8，b=9代入式子3a+2b可得，
3a+2b
=8×3+2×9
=24+18
=42；
故选：B．
______ is used to refer to backward countries.
A. Developing countries B. Underdeveloped countriesC. Developed countries D. Old countries
测量潜在损失即（）。
A.风险监测
B.风险测度
C.风险评估
D.风险识别
