RF antenna had been removed翻译成中文

RF antenna had been removed翻译成中文 had been adattatore antenna what had been done had been done. where had she been? had been什么时态 英语翻译had been reading 英语翻译For instance,the electronics units mounted on a spacecraft platform will be required toperform their required function in the presence of RF emissions back scattered from thetelemetry transmitter antenna sending signals to Earth. 英语翻译The directivity of an antenna has been defined as “the ratio of the radiation intensity in a given direction from the antenna to the radiation intensity averaged over all directions”.In other words,the directivity of a nonisotropic so have been talking, had been told? 英语,has been和 had been Had been telling和 Had told 求问had gone和had been had been doing 和had been done有什么差别 had been doing 和had been done有什么差别? he had been reduced.he had been reduced 啥意思 had been和had been to的区别 什么时候用had been in什么时候用had been to?