[填空题]To separate hydrogen from oxygen needs electricity that can be created by______.

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[填空题]A manager can get the information he needs from ______.

[填空题]Houdini managed to get oxygen from air pockets caught between ______.

[填空题]We must derive hydrogen from renewable sources with a view to a pure hydrogen economy.

[填空题]oxygen

[填空题]The hydrogen can be generated from ____________ or produced by reforming fossil fuels.

[填空题]The hydrogen can be generated from __________________ or produced by reforming fossil fuels.

[填空题]We must derive hydrogen from ____________ with a view to a pure hydrogen economy.

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