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both of these sentences which is right? The membrane free single-chamber air cathode MFCs were constructed, whose effective liquid volume were about 10mL, electrode spacing were 2cm, and electrode areas of cathode and anode were both 3.14cm2. The membrane free single-chamber air cathode MFCs were constructed, its effective liquid volume were about 10mL, electrode spacing were 2cm, and electrode areas of cathode and anode were both 3.14cm2.

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The membrane free single-chamber air cathode MFCs were constructed, its effective liquid volume WAS about 10mL, electrode spacing WAS 2cm, and electrode areas of cathode and anode were both 3.14cm2.

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