单项选择题
A.≥76.5℃ B.≥78.5℃ C.≥79.5℃ D.≥80.5℃
A.≤1.0mg/100mL B.≤2.0mg/100mL C.≤5.0mg/100mL D.≤10.0mg/100mL
A.氮气 B.电 C.蒸汽 D.除盐水
A.≤0.002% B.≤0.003% C.≤0.004% D.≤0.005%
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