问题 单项选择题

SNMPv2表的状态列有6种取值,管理站不可以便用set操作设置的状态是 (43)

A.noReady

B.notInservice

C.createAndGo

D.destroy

答案

参考答案:A

解析:[要点解析] SNMPv2表的状态列有6种取值:①active (可读写)、②notInservice(可读写)、③noReady(只读)、④createAndGo(只写不读)、⑤createAndWait(只写不读)、⑥destroy(只写不读)。这6种状态中除“noReady”状态之外;其他5种状态是管理站可以用set操作设置的状态。对于“active”、“notInservice”、“noReady”这3种状态可作为响应管理站的查询而返回的状态,而“destroy”状态不能作为响应管理站的查询而返回的状态。

单项选择题

The great advance (91) rocket theory 40 years ago showed that liquid-fuel rockets were far (92) in every respect to the skyrocket with its weak solid fuel, the only kind of rocket then known. (93) , during the last decade, large solid-fuel rockets with (94) fuels about as powerful as liquid fuels have (95) their appearance, and it is a favorite layperson’s question to (96) which one is "better". The question is meaningless. (97) might as well ask whether a gasoline or a diesel engine is "better". It all (98) on the purpose. A liquid-fuel rocket is complicated, (99) has the advantage that it can be controlled beautifully. The burning of the rocket engine can be stopped completely; it can be reignited when (100) . (101) , the thrust can be made to vary by adjusting the speed of the fuel pumps. A solid-fuel rocket, on the other hand, is rather (102) in construction, (103) hard to build when a really (104) size is desired. But once you have a solid-fuel rocket, it is ready for action (105) very short notice. A liquid-fuel rocket has to be fueled first and cannot be (106) readiness for very long after it has been fueled. (107) , once a solid-fuel rocket has been ignited, it will keep burning. It cannot be stopped and reignited (108) desired (it could conceivably be stopped and reignited after a pre-calculated time of burning has elapsed, and its thrust cannot be varied. Because a solid-fuel rocket can be kept ready for a long time, most military missiles (109) solid fuels, but human-piloted spaceflight needs the fine adjustments that can (110) be provided by liquid fuels.

A.wonder

B.acquire

C.inquire

D.judge

填空题