A.0.1% B.0.2% C.0.3% D.0.4%
A.4 B.5 C.6 D.8
A.牢固 B.拉力大于100N C.有防拉脱装置 D.无尖锐边缘
A.8%～13.7% B.10%～13.7% C.8%～14.7% D.10%～14.7%
A.±2 B.±3 C.±4 D.±5
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