题目内容

双绞线电缆中的4对线用不同的颜色来标识，EIA/TIA 568A规定的线序为（），而EIA/TIA T568B规定的线序为（）。 EIA/TIA 568A规定的线序为（）

A. 橙白；橙；绿白；蓝；蓝白；绿；褐白；褐
B. 蓝白；蓝；绿白；绿；橙白；橙；褐白；褐
C. 绿白；绿；橙白；蓝；蓝白；橙；褐白；褐
D. 绿白；绿；橙白；橙；蓝白；蓝；褐白；褐

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A multicast router may receive thousands of multicast （） every day for different groups. If a router has no knowledge about the membership status of the （） , it must broadcast all of these packets. This creates a lot of traffic and consumes （）. A better solution is to keep a list of groups in the network for which there is at least one loyal member. （） helps the multicast router create and update this list. For each group, there is one router that has the duty of distributing the （） packets destined for that group. This means that if there are three multicast routers connected to a network, their lists of groupids are mutually exclusive. A host or multicast router can have membership in a group. For each group, there is one router that has the duty of distributing the （） packets destined for that group.

A. anycast
B. multicast
C. unicast
D. broadcast

简述以学生为中心的教学结构的特点。

医院门诊收费员，住院处收费员，药房收费员，药品库房记账员，商场收款（银）员所从事的工作，经常与现金接触，必须取得会计从业资格（）

A. 对
B. 错

造价上亿的建筑，寿命应该在20-30 年，但很多城市建筑拆了建，建了拆，谈谈你的看法？