一台多用户微机的串行通信接口内含Intel 8251A、MC1 488及MC1 489芯片，主机与汉字终端之间通过直接连接实现通信，则终端所接收到的信号电平为

When using Ampere’s law, we have to know how much the current passing through the area enclosed by the chosen path is. How much is I(enclosed) in the figure？

A、-I

B、0

C、I

D、3I

When using Ampere’s law, we have to know how much the current passing through the area enclosed by the chosen path is. In the following figure,

A. Performs switching and routing duties

B. A router that directly connects to a switch

C. A multi-purpose switch fabric used in full mesh environments

D. A switch that directly connects to a router

A. by snooping the CoS marking on the incoming frames

B. by using RTP hello messages between the switch port and the Cisco IP Phone

C. by using CDP

D. by using DHCP snooping

E. by snooping the incoming 802.1Q VLAN tag

A. by snooping the CoS marking on the incoming frames

B. by using RTP hello messages between the switch port and the Cisco IP Phone

C. by using CDP

D. by using DHCP snooping

E. by snooping the incoming 802.1Q VLAN tag

A．Which,how much

B．Who,how old

C．where,how much

D．what,how old

– When are you leaving？ -- _________.

A、How much？

B、In an hour.

C、One hundred dollars.

D、I’m fine.

How much does the full fare cost？

[A] 1,402 pounds.

[B] 1,204 pounds.

[C] 2,104 pounds.

[D] 4,102 pounds.

A．when

B．how much

C．how many

D．why