Contracts and agreements are often times unenforceable or hard to enforce in which of the following alternate facility recovery agreement?在以下哪个备用设施恢复协议中，合同和协议往往不能执行或者难以执行？（）
- A、hot site. 热站
- B、cold site. 冷站
- C、reciprocal agreement. 互惠协议
- D、warm site. 温站
正确答案:C
答案解析:有
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