摘要： Picking up the guest1 welcomeOn behalf of XX department , I’m very glad to welcome you here. 2 introductionPlease let me introduce myself. I’m （self-i 阅读全文

摘要： DIP 滑动开关 簧片继电器 DE-9插头和插座 驻极体麦克风 数码管 光耦 耳机插头 BGA 阅读全文

摘要： The UK government's plans for regulation of the internet and social media contained a long list of online harms. Among them was excessive screen use b 阅读全文