The TCP protocolis a （）layer protocol.

The connection between two networks from an intemet is handled by a machine known as a（）

The parties to government procurement refer to the principal entities of all kinds that enjoy rights and undertake obligations in government procurement, including the procuring entities, the （）and the procuring agencies.

There are strategies typically deal with threats or risk that may have negative impacts on project objectives if they occur, some other strategies are suggested to deal with risks with potentially positive impacts. （）is a risk response strategy that may be adopted for either threats or opportunities.