单项选择题
A.10－20mm B.20－40mm C.50－300mm D.40－50mm
A.50－300mm B.300－350mm C.350－1200mm D.1200－1300mm
A.1300mm B.1150mm C.1200mm D.14000mm
A.40－45℃ B.45－20℃ C.0－45℃ D.40－20℃
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