如果父母做出不道德的事，我们对其进行批评和制止是[ ]
A、不孝顺的表现
B、为父母好，是孝的表现
C、触犯法律的
D、合法但是不合情
答案：B
鸡肉在冰箱内的存放期限是（）。
A.冷藏2～3天，冷冻6个月
B.冷藏1～2天，冷冻6个月
C.冷藏2～3天，冷冻1年
D.冷藏5～7天，冷冻1年
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 is chosen as part of the connection setup and stored in tables inside the (4) .That route is used for all 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-oriented service, each packet carries an (5) telling which virtual circuit it belongs to.
空白（3）处应选择（）
A.source
B.route
C.Destination
D.host
