碳的化合价是4价。

Carbon has a valency of 4.

《牛津词典》

碳的化合价是四价。

Carbon has a valence of four.

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(化学)具有一个以上的化合价的，或具有三价或更高价的。

(Chemistry) having more than one valence or having a valence of 3 or higher.

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(化学)具有一个以上的化合价的，或具有三价或更高价的。

(Chemistry) having more than one valence or having a valence of 3 or high er.

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原子数，原子价，化合价。

The number of atoms in a molecule.

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它是含有0.01 ~6摩尔%范围的金属元素化合价为3价、4价或5价的任意一种的金属氧化物的氧化镁蒸镀材料。

The magnesium oxide vapor-deposition material comprises metal oxide in which the valence of the metallic element (s) is any of 3, 4 and 5 in the range of 0.01 to 6 mol %.

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它是含有0.01 ~6摩尔%范围的金属元素化合价为3价、4价或5价的任意一种的金属氧化物的氧化镁蒸镀材料。

The magnesium oxide vapor-deposition material comprises metal oxide in which the valence of the metallic element (s) is any of 3, 4 and 5 in the range of 0.01 to 6 mol %.

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