单项选择题
A．1mm B．0.7mm C．0.5mm D．0.2mm
A．1.2mm B．1.5mm C．2.0mm D．3mm
A．1mm B．1.5mm C．17mm D．1.2mm
A．6~8° B．6~10° C．8~15° D．10~15°
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