单项选择题
A.1mm±1mm B.1.5mm±1mm C.2mm±1mm D.3mm±1mm
A.3 B.4 C.5 D.6
A.1 B.1.5 C.2 D.2.5
A.≤0.4s B.≤0.7s C.≤0.6s D.≤0.8s
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