声波在常温下，在固体中传播的速度大于在（）中传播的速度，更大于在空气（或气体）中传播速度。
“Y”表示（）坡口。 V形。 V形带钝边。 带钝边单边V形。 单边V形。
根据是否计算半成品成本，分步法可分为（）分步法和（）分步法。
自然选择的基本论点是变异和遗传、繁殖过剩、（）和适者生存。
PassGuide has a BGP network and a BGP route of 197.22.129.0/24 that should be propagated to all of the devices. The route is currently not in any of the routing tables. The PassGuide administrator determines that an access list is the cause of the problem. The administrator changes the access list to allow this route, but the route still doesnot appear in any of the routing tables. What should be done to propagate this route（） Use the service-policy command to adjust the QOS policy to allow the route to propagate.。 Clear the BGP session.。 Use the release BGP routing command.。 Change both the inbound and outbound policy related to this route.。 None of the other alternatives apply。
In a VoIP network， which three call signaling protocols are supported by the Cisco CallManager for call setup， call maintenance， and call teardown？ （）
