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用户提出需求并提供经费，委托软件公司开发软件。但在双方商定的协议中未涉及软件著作权的归属，则软件著作权属于（）所有。
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在查找路由表时如果发现有多个选项匹配，那么应该根据（1）原则进行选择。假设路由表有下列4个表项，那么与地址139.17.145.67匹配的是（2）。 空白（1）处应选择（）
网桥是一种（1）设备，在现代网络中，用（2）代替了网桥。 空白（1）处应选择（）
Both bus and tree topologies are characterized by the use of multipoint(1)．For the bus,all stations attach,through appropriate hardware(2) 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(3).Atransmission from any station propagates the length of the medium in both directions and can be received by all other(4).At each end ofthe bus is a(5),which absorbs any signal, removing it from the bus． 空白（5）处应选择（）
One ofthe main resposibilities of ICMP is to report(1).Although technology has produced increasingly relaible transmission media, errors still exist and must be handled. IP is an (2) protocol. This means that error checking and error control are not a concern of IP. ICMP was designed, in part, to compensate for this shortcoming. Howerver, ICMP does not (3) errors, it simply report them. Error correction is left to the higher-level potocols. Error messages are always sent to the original (4) because the only information available in the datagram about the route is the source and destination IP addresses. ICMP use the source IP address to sent the error massage to the source of the (5). 空白（4）处应选择（）
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