问题 单项选择题

在关于①Ethernet②Token Bus⑨ATM LAN④FDDI⑤Token Ring的组合中,属于共享介质局域网的是 (9)

A.①②③④
B.①②④⑤
C.②⑧④⑤
D.①③④⑤

答案

参考答案:B

解析:
传统的局域网技术是建立在“共享介质”的基础上,网中所有结点共享一条公共通信传输介质,典型的介质访问控制方式是CSMA/CD,Token Ring,Token Bus;介质访问控制方式用来保证每个结点都能够“公平”的使用公共传输介质。 共享介质局域网又可以分为Ethernet、Token Bus、Token Ring与FDDI以及在此基础上发展起来的Fast Ethernet、FDDI II等。

选择题
单项选择题

Beyond question, Clinton was supposed to close up, stay out of sight, and avoid second- guessing his wife’s boss. After his ego blustered into oncoming traffic during Hillary’s heated primary race (1) Obama, the nation suffered from yet another turn of Clinton fatigue.

(2) this week Bill Clinton showed an instinct for robust, inclusive leadership that the (3) White House occupant could make good use of right for the time being. With President Obama struggling to (4) the political damage from the Gulf oil spill, Clinton not only can’t help himself—he’s worth being listened.

The conventional-wisdom (5) on President Obama’s early reaction to the spill was (6) he didn’t emote enough. He didn’t feel the (7) of all those people in the crisis whose livelihood would be destroyed, whose clean waters and wildlife would be (8) in black gunk.

Clinton considers this is an unfair (9) but offers a different—and more pointed— lesson to his young successor. "I think we ought to (10) in the same boat for a while... Let’s just (11) the problem, and then we can hold everybody responsible and emote or not emote, " Clinton conversed (12) CNN Anchor Wolf Blitzer.

Obama’s first (13) after the oil spill was to "feel the blame" rather than "feel the pain, " which are pretty sarcastic words as it were. No one intends to let British Petroleum (BP) management (14) the hook—for dangerously cutting corners, and for a (15) safety record. However, the President’s (16) focus on scolding BP consumed (17) White House energy while the oil gushed.

Great leaders don’t rush to criticise; Instead they instinctively (18) solutions. Rudy Giuliani, who didn’t stop to blame (19) intelligence for letting it happen, stood out from New York mayor with a girlfriend problem to 9/11 hero when he took control of a crisis and instilled confidence that a ravaged city could (20) beyond a terrorist attack.

17()

A.abundant

B.valuable

C.surplus

D.restless