晶体三极管的等效理解。晶体三极管工作在截止状态时,C E 之间相当于开关________(闭合/断开);工作在饱和状态时,C E 之间相当于开关________(闭合/断开);工作在放大状态时,C E 之间相当于________。
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在工程估算分析时,可以认为硅材料三极管的输入特性曲线与硅二极管的正向伏安特性曲线相似。( )
A. 对
B. 错
The BDS space segment __________ a number of satellites.(由...组成)
The BDS ground segment ________(由...组成)various ground stations,_______(包括)master control stations, time synchronization/uplink stations, monitoring stations, ________(也)operation and management facilities of the inter-satellite link.
It also_______ China fight the COVID-19_______ high precision from space.