梁山伯与猪硬来
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【用车小芝士】转向灯为什么是“哒哒”声？早期汽车制造技术落后，当时转向灯的一亮一灭，是通过电路中的闪光器和继电器来实现的，继电器的结构就是一个电磁铁和一个开关，在它工作吸合的一瞬间就会发出哒的一声，转向灯反复的哒哒声，就是闪光继电器工作时发出的。如今，汽车转向灯的控制不会用继电器了，听到的声音是模拟出来，目的就是让驾驶员知道转向灯是否打开，提高驾驶安全性。
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