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【单选题】
按照基因工程工作安全等级的划分标准,“对人类健康和生态环境尚不存在危险”和“对人类健康和生态环境产生高度危险”分别属于安全等级( )A.
I、III
B.
II、III
C.
III、IV
D.
I、IV
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