The routing of a call or message that is placed for a disconnected or nonexistent telephone number or terminal address to an operator position or to an especially designated terminal 把对网络中未连接的或不存在的电话号码（或终端地址）所进行的呼叫（或报文）转交给操作员（或专门指定的终端）的路由选择方法。
3.
Safety of industrial trucks - self - propelled trucks up to and including 10000 kg capacity and industrial tractors with a drawbar pull up to and including 20000 n . additional requirements for trucks with elevating operator position and trucks specifically designed to travel with elevated loads 工业货车的安全.荷载能力至10000kg的自行货车和拉杆拉力至20000n的工业牵引车.带高架驾驶位的货车和专为超负荷运行设计的货车的附加要求
4.
Safety of industrial trucks - self - propelled trucks up to and including 10 000 kg capacity and tractors with a drawbar pull up to and including 20 000 n - part 2 : additional requirements for trucks with elevating operator position and trucks specifically designed to travel with elevated loads 工业货车的安全.容量为10000kg及以下的机动货车和拖杆拉力为20000n及以下的牵引车.第2部分:带有高架操作者位置的货车和特别为旅游设计的带有高架荷载的货车的附加要求
