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Heavy water acts to slow down neutrons in some types of nuclear reactors. The molecular mass of heavy water is 20 AMU (atomic mass units).

Which of the following is the molecular formula of heavy water?

A

${ H }_{ 2 }{ }^{ 18 }O$

B

$D_{ 2 }O$

C

${ H }_{ 2 }{ O }_{ 2 }$

D

$HOD$

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