单项选择题
A.5-10针/10cm B.12-16针/10cm C.5-15针/10cm D.8-9针/10cm
A.10-15cm B.3-5cm C.1.5-2cm D.10-15mm
A.5-10cm B.3-5cm C.10-15cm D.3-5mm
A.2-3mm B.3-4mm C.2-5mm D.3-5mm
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