（）变更时指风险很小或没有风险的变更，并且执行这些变更的步骤和方法已经很成熟，这些变更事先己经得到审批并记录在案，遵循简化的标准变更管理过程
A.标准变更
B.紧急变更
C.普通变更
D.常规变更

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