Подростки распылили перцовый баллончик на пассажиров электрички под Петербургом20:54
「要一次又一次重述那段經歷非常困難……我覺得自己才是受害者。」她說。
。体育直播对此有专业解读
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Years ago, people figured out Raspberry Pi’s can accidentally double as FM radio transmitters without a need for any radio front-end (if we don’t count a single jumper wire working as an antenna). They achieved this by tying a GPIO pin to a software-controlled clock around 100 MHz to modulate audio. This created a low-powered FM radio transmitter. Due to the pin producing a square wave instead of a neat sine wave, it also emitted weaker harmonics at 300MHz, 500MHz, etc., but any basic FM radio could pick up the audio. I wondered if a similar feat could be achieved by much less powerful Raspberry Pi Pico microcontrollers.
南方周末科创力研究中心，搭建中国企业科创力数据库，通过对运营主体/控股股东在中国的A股、港股和美股企业（也包括少量未上市，但有发布经第三方审计年报的企业）的研发投入、研发产出和企业经营等近30个指标进行梳理，以追踪中国企业的科创活动。