单项选择题
A.15，53 B.15，55 C.14，55 D.11，55
A.0.2s B.0.25s C.0.3s D.0.45s
A.≥0.4s B.≤0.4s C.≥0.35s D.≥0.45s
A.0.1～0.3mm B.0.15mm C.0.1～0.35mm D.0.35mm
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