Can I in-game enable blocks?

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I am playing Minecraft modpack with Galacticraft, NEI, Mekanism. (There are actually more mods(75+) but these are important for question) And for some reason, Galacticraft compressor and electric compressor are disabled and not even in NEI. Is here an option to enable them in-game?
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Images: Erik Mclean, Ylanite Koppens, Ylanite Koppens, Tatiana Syrikova