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Because free hydrogen does not exist in nature, it...

GRE

多选题

Because free hydrogen does not exist in nature, it cannot be ______ a primary energy source, as coal or oil can.

发布日期：2022-07-13

A.borne in mind

B.taken into account

C.concerned with

D.considered

E.remarked upon

F.thought of as

标签： free hydrogen exist nature primary

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