n.

氧混


(

98%


2%氧,供潜水员在深水中维持呼吸用)
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hydrocylinder,
hydrocyst,
hydrocystoma,
hydrodealkylation,
hydrodecyclization,
hydro-dehazer,
hydrodemetalization,
hydrodenitrogenation,
hydroderivating,
hydroderma,
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heliotropism,
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heliotypography,
heliotypy,
heliox,
heliozincograph,
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heliozoan,