DTR100前面板AC开关（）。 A.通/断控制点在电源组件的DC/DC转换电路 B

Flow control is a function that prevents network congestion by ensuring that (66) do not over-whelm (67) with data. There are three commonly used methods for handling network congestion. (68) is used by network devices to temporarily store bursts of excess data in memory until they can be processed. (69) are used by receiving devices to help prevent their buffers from overflowing. (70) is a flow-control scheme in which the source device requires an acknowledgment from the destination after a certain number of packets have been transmitted.

A．.transmitting devices

B．transmitted devices

C．receiving devices

D．received devices

元件在flash中可以分为（）、（）和（）

( )可以承受较大的轴向力。

A．双圆螺母

B．弹性挡圈

C．紧定螺母

实现容错计算的主要手段是冗余。______中动态冗余的典型例子是热备系统和冷备系统。

A．结构冗余
B．信息冗余
C．时间冗余
D．冗余附加技术

某矿物的干涉色为二级绿，在45°位加云母试板，如同名半径平行，干涉色升高为二级蓝，如异名半径平行，干涉色降低为二级黄。