由分段函数可知f(5)=f(10)=f(15)=18,
故选:B.
The man to ______ my father is speaking is my uncle.
A.him
B.that
C.who
D.whom
160km/h<vmax≤200km/h时,下道避车距钢轨头部外侧距离不小于()。
A、1.5m
B、2m
C、2.5m
D、3m