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正弦波自激振荡器振荡建立过程，晶体管的工作状态是（）
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正弦波振荡器是不需要输入信号控制就能自动地将直流能量转换为特定频率和振幅的正弦交变能量的电路
Nowadays, travelers arriving at the airport arewelcomed by 11 tall earthen mounds (土堆)，the _1 __of emperors in Western HanDynasty(朝代), built around the 1st century.Thus the year 841 BC marked the beginning of ___2___ and __3__ recordkeeping.The beacon tower (烽火台) above the LishanMountain, where Huaqing Hot Spring islocated, is an _4_ reminder of thestory of “the most expensive smile” that caused the__5__ of the dynasty.It exhibits over 3,000 historical __6__,the main attractions being the bronze ware (青铜器), ceramics(陶瓷制品) and beautiful wallpaintings from the Tang Dynasty tombs.
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