本地电话网的二级网的结构有分区汇接和（）两种。
参考答案：全覆盖
In the contract, usually there is a ________ clause to protect the buyer against loss from delay of the shipment of the goods.
A．payment
B．shipment
C．penalty
D．quality
罪犯群体的消极行为多发生在罪犯（）中。
A.正式群体
B.反改造尖子
C.非正式群体
D.改造积极分子
