试题与答案

旋转体不平衡所产生的离心力大小与旋转体的不平衡质量的大小有关,而与其自身的转速高低无

题型:判断题

题目:

旋转体不平衡所产生的离心力大小与旋转体的不平衡质量的大小有关,而与其自身的转速高低无关。()

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D

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题型:单项选择题

Frame Relay is simplified form of (66) , similar in principle to (67) , in which synchronous, frames of data are routed to different destinations depending on header information.

Packets are routed throught one or more Virtual Circuits known as (68) . Most Virtual Circuits are (69) , which means that the network provider sets up all DLCI connections at subscription time. (70) are also part of the Frame Relay specification. They privide a link that only lasts only as long as the session.

70()

A.Permanent Circuits

B.Permanent Virtual Circuits

C.Switched Virtual Circuits

D.Switched Circuits

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