单项选择题
A.25°-30° B.30°-35° C.35°-40°
A.15mm B.20mm C.10mm
A.15°～20° B.30°～45° C.75°～80°
A.用火烤 B.用硬物清除 C.用热水或蒸汽 D.用高温火焰
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