该公司在深圳上市，其股票周四的收盘价为人民币18.20元，跌0.4%，但仍较年初上涨92%。

The Shenzhen-listed stock lost 0.4% Thursday to end at 18.20 yuan, up 92% so far this year.

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每个碳原子的价键为四。

Every carbon atom has four bonds.

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作了总硒和四价硒的回收，平均回收率为91—105％。

The recovery of total Se and Se(IV) is 91-105%.

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碳的化合价是四价。

Carbon has a valence of four.

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碳的化合价是四价。

Carbon has a valence of four.

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