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【单选题】
《危险化学品登记管理办法》规定，已进行危险化学品登记的单位在生产规模或产品品种及其理化特性发生重大变化时，（ ）个月内对发生变化的内容办理重新登记手续。
A.
1
B.
2
C.
3
D.
4
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