题目内容

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

A. 对
B. 错

查看答案

搜索结果不匹配？点我反馈

更多问题

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 the5 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.

研究生院

毕业证书

Career planning is a process of understanding oneself, exploring career options, making wise decisions and moving forward.

A. 对
B. 错