Here’s how it works. Since we began testing cameras more than two decades ago, TechRadar has reviewed every Canon camera worth writing about, covering everything from premium compacts to the ...

Canon Inc. is a Japanese multinational corporation specializing in the manufacture of imaging and optical products, including cameras, camcorders, photocopiers, steppers, computer printers and medical ...

The Canon RF 200-800mm f/6.3-9 IS USM is the reigning superzoom champion in terms of focal range and is impressively lightweight and compact for its reach. However, its mediocre maximum aperture does ...

烃类：包括烷烃、烯烃、芳香烃等。如常见的苯系物，像苯、甲苯、乙苯、二甲苯和苯乙烯等。 卤代烃：如二氯甲烷、氯仿、四氯化碳、三氯乙烯等，是被一个或多个卤素原子取代的烃类物质。 其他：还包括氧烃和氮烃等，如有机酮、胺、醇、醚、酯等。 来源 ...