理想变压器在现实世界中是不存在的，但我们在一些不用很精确的场合，可以把缠绕很多匝的、耦合紧密的铁芯变压器近似为理想变压器，比如电力系统中的变压器。 片野 I'd Use 'on' mainly because a weekend is 2 times (or more). 'At' is a lot more particular, for a smaller area or shorter time, While on/in are used for for a longer period durations or more substantial Areas. "Let's take in at an Itali... https://sexcamgirls.live/