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道岔按使用类型分为哪三种？

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You are creating a Window Commnunication Foundation (WCF) service application. The application needs to service many clients and requests simultaneously. The application also needs to ensure subsequent individual client requests provide a stateful conversation. You need to configure the service to support these requirements. Which attribute should you add to the class that is implementing the service?（）

A. [ServiceBehavior(lnstanceContextMode = lnstanceContextMode.PerSession, ConcurrencyMode = ConcurrencyMode.Single)]
B. [ServiceBehavior(lnstanceContextMode = lnstanceContextMode.PerCall, ConcurrencyMode = ConcurrencyMode.Reentrant)]
C. [ServiceBehavior(InstanceContextMode = lnstanceContextMode.PerSession, ConcurrencyMode = ConcurrencyMode.Multiple)]
D. [ServiceBehavior(lnstanceContextMode = lnstanceContextMode.PerCall, ConcurrencyMode = ConcurrencyMode.Multiple)]

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Z公司涉及一桩诉讼，根据以在经验及公司所聘请律师本期的意见判断，公司在该桩诉讼中胜诉的可能性为30%，败诉的可能性有70%。如果败诉，公司将要支付40万元--60万元的赔偿款。据此，Z公司应在本期末资产负债表中确认预计负债金额（）。

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从业人员对管理人员强令冒险作业的命令，应该（）。

A. 拒绝
B. 服从指挥
C. 与管理人员讨价还价

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《不安全事件说清楚管理制度》中发生火灾事故“说清楚”的内容有哪些？

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