单项选择题
A.142±5mm B.145±5mm C.147±5mm D.152±5mm
A.≥20mm B.≤20mm C.＞20mm D.＜20mm
A.1±0.5mm B.1.5±0.5mm C.1±1.5mm D.1.5±1mm
A.＜7mm B.≤7mm C.≥7mm D.＞7mm
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