单项选择题
A.上定下配B.下定第二天配C.即定即配D.间隔24h配
A.3-6周B.2-5周C.4-7周D.5-8周
A.20sB.40sC.60sD.30s
A.1:150B.1:250C.1:500D.1:1000
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