Which set of materials is used as a moderator in nuclear reactor ?

1.	Which set of materials is used as a moderator in nuclear reactor ?
A.	Zircalloy & berrylium.
B.	Zircalloy & heavy water.
C.	Zirconium & berrylium.
D.	Heavy water & berrelium.
Answer» E.

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Which set of materials is used as a moderator in nuclear reactor ?

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