单项选择题
A.半开 B.闭锁 C.开锁 D.全开
A.8 B.10 C.12 D.15
A.0.5mm B.1.0mm C.1.5mm D.2.0mm
A.10±0.20mm B.11±0.20mm C.12±0.20mm D.13±0.20mm
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