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You should not have a line height set in the ePub. Let the user set the line height. A lot of programs and some Readers allow you to set the line height and that's how it should be.
As for 2 page view, that's up to the software being used. Mos don't have a 2 page view. A 1 page view is the default and every program used to view ePub has that.
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