单项选择题
A.5～6mm B.6～9mm C.6～10mm D.5～8mm
A.15mm B.16mm C.18mm D.20mm
A.（43±2）mm B.（43±5）mm C.（43±6）mm D.（43±10）mm
A.90mm B.100mm C.110mm D.130mm
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