单项选择题
A.2.0mm B.2.6mm C.3.1mm D.3.2mm
A.2.8mm B.3.1mm C.3.6mm D.4.2mm
A.10s B.13s C.15s D.20s
A.小于5° B.小于6° C.小于7° D.小于8°
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