单项选择题
A.600mm B.900mm C.l000mmn D.1200mm
A.l000℃ B.1580℃ C.2350℃ D.3560℃
A.l0mm B.l5mm C.25mm D.50mn
A.0.5m B.0.5~lm C.lm D.l.2~1.5m
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