单项选择题
A.50±5℃B.52±5℃C.50±2℃D.52±2℃
A.≤40minB.＜40minC.≤45minD.＜45min
A.40〜60B.40〜65C.45〜60D.45〜65
A.65±5℃B.60±5℃C.70±5℃D.55±5℃
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