喷油泵每循环供油量取决于() 柱塞行程。 针阀升程。 柱塞有效行程。 供油提前角。
某10年期、年息票收入为50元的债券,以1000元购入,它的到期收益率是11%。如果一年后债券的价格上升到1080元,本年持有收益率是()。 7%。 8%。 13%。 10%。
简述网络财务的实施方案。
事故救援与抢险救灾,可凭调度命令乘车,()乘车有效。 单程。 往返。 两次。 一次。
Cisco NX-OS Software supports SNMPv1, SNMPv2c, and SNMPv3. Both SNMPv1 and SNMPv2c use a community-based form of security. SNMPv3 provides secure access to devices by a combination of authenticating and encrypting frames over the network. Which security features are provided in Cisco NX-OS SNMPv3? () encryption—scrambles the packet contents to prevent them from being seen by unauthorized sources。 password—a password (community string) sent in clear text between a manager and agent for added protection。 authentication—determines that the message is from a valid source。 message integrity—ensures that a packet has not been tampered with while it was in transit 。 user—to determine if user authentication is used instead of community string。
欧洲历史上第一位工业设计师是()