进入减速车道时怎样使用灯光？（）
A．开启左转向灯
B．开启右转向灯
C．开启危险报警闪光灯
D．开启前照灯
参考答案：B
______ is permanently stored in the computer and provides a link between the hardware and other programs that run on the PC.
A．Interface
B．Operating system
C．Internet
D．Applicaion software
T门
