機炮(英語:Autocannon)主要是表示小口徑並可自動射擊的火炮。航空機關炮,又稱航炮,是裝載於航空器上,口徑大於等於20毫米的自動武器[1]。機砲也有安裝於海軍艦艇上的小口徑艦炮,以及安裝於軍用車輛或裝甲車上的小口徑火炮。
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/6/67/%E7%BE%8E%E8%A3%BD20%E5%85%AC%E5%8E%98%E6%A9%9F%E7%A0%B2.jpg/640px-%E7%BE%8E%E8%A3%BD20%E5%85%AC%E5%8E%98%E6%A9%9F%E7%A0%B2.jpg)
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/1/1c/ROCMC_Petty_Officer_and_Mother_Help_Child_Climbing_up_Humvee_20140327.jpg/640px-ROCMC_Petty_Officer_and_Mother_Help_Child_Climbing_up_Humvee_20140327.jpg)
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