1、
Version B : Proton is positive , election negative and neutron neither.
例7.质子带阳电, 电子带阴电,而中子既不带阳电也不带阴电.
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2、
A proton positive charge and an electron a negative charge, but a neutron has neither.
质子带正电,电子带阴电, 而中子既不带正电,也不带阴电.
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