自助设备错账查询及挂账处理描述错误的是（）。

A.自助设备发生的长短款主要分为账务的长短款和现金长短款

B.离行式自助设备发生的长短款挂销账，应由现金清点人员填制传票，经账务归属部门营运主管签字确认，由自助设备管理人员进行账务处理。

C.自助设备现金长短款挂账后，原则上应在三日内查明原因，及时调账。

D.对超过六个月的自助设备现金长短款挂账，各行应及时进行收益或报损清理，不得长期挂账。

Both bus and tree topologies are characterized by the use of multipoint (16) ．For the bus，all stations attach，through appropriate hardware (17) known as a tap，directly to a linear transmission medium，or bus．Full-duplex operation between the station and the tap allows data to be transmitted onto the bus and received from the (18) ．A transmission from any station propagates the length of the medium in both directions and can be received by all other (19) ．At each end of the bus is a (20) ，which absorbs any signal，removing it from the bus．

A．tree

B．bus

C．star

D．ring