患者女性，18岁。主因全身毛发脱落2个月就诊。患者于2个月前，在高考失利后，出现睡眠不佳，后开始头发脱落，此后眉毛、腋毛、阴毛、毳毛也出现脱落，曾用外用药物治疗无明显效果。查体：心肺腹未见异常，毛发、眉毛、毳毛全部脱落。

最可能的诊断是（）。

A.斑秃

B.脂溢性脱发

C.假性斑秃

D.全秃

E.普秃

For（1） service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new （2） for every packet sent. Instead,when a connection is established, a route from the （3）machine to the destination machine ischosen as part of the connection setup and stored in tables inside the（4）That route is used forall traffic flowing over the connection, exactly the same way that the telephone system works.When the connection is released, the virtual circuit is also terminated. With connection-orientedservice, each packet carries an （5）telling which virtual circuit it belongs to.

（5）是（）

A.address

B.identifier

C.interface

D.element