单项选择题
A.2℃ B.1℃ C.3℃ D.5℃
A.不锈钢 B.聚四氟乙烯 C.铜质 D.聚氯乙烯
A.1/3 B.2/3 C.1/2 D.3/4
A.18mm B.19mm C.20mm D.21mm
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