单项选择题

在图坐标系中（为交变应力的幅度，为平均应力），和两点均位于一条过原点的直线上，设和两点对应的两个应力的循环特征为，，最大应力分别为和，则           。

A．
B．a
C．
D．
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After working all night and successfully configuring a Cisco router for the Ezonexam network you save your changes on the startup config, reboot the router, and go out for a cigarettE.When you return, none of your changes are active and the router boots to the initial configuration mode! Which of the choices below indicates the source of your problem?A.Hardware failure in NVRAM prevents the router from loading the configB.Startup-config in flash is corrupt and cannot be analyzedC.Router configuration-register set to bypass startup configurationD.Startup-config in NVRAM is corrupt and cannot be analyzedE.None of the above
A.Hardware
B.Startup-config
C.Router
D.Startup-config
E.None
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There are 2 switches in the Ezonexam LAN, with no routers. Ports 1, 2 & 3 are assigned to VLAN 1 in switch 1 and 2 and ports 4, 5 & 6 are assigned to VLAN 2 in both switches. These two switches are connected together via a trunked link. Which of the conditions below would verify trunk and VLAN operation? (Select all valid answers)A.Host 1 on VLAN 1 can ping Host 2 on VLAN 1B.Host 1 on VLAN 1 can ping Host 4 on VLAN 2C.Host 1 on VLAN 1 can not ping Host 2 on VLAN 1D.Host 4 on VLAN 2 can not ping Host 1 on VLAN 1E.Host 4 on VLAN 2 can ping Host 2 on VLAN 2
A.Host
B.Host
C.Host
D.Host
E.Host
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