Lin is going to graduate a year later. He intends to further his study in the UK by working toward a_________ degree.

A.车辆前后转向架两轴间距离
B．同一转向架前后两车轴中心线间的水平距离
C．车辆前转向架与后转向架中心水平距离
D．车辆前后车钩中心水平距离

A、刚玉
B、钻石
C、长石
D、石膏

A.网关
B．网桥
C．中继器
D．路由器