A hydrogen-oxygen fuel cell uses
A) hydrogen and water and generates electricity and oxygen.
B) hydrogen and oxygen and generates electricity and water.
C) carbon dioxide and water and generates electricity and hydrogen.
D) hydrogen and water and generates electricity, oxygen and carbon dioxide.
B
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Indicate whether the statement is true or false
Which of the following democracies represents a unitary state in which power is concentrated in the hands of the central government?
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