单项选择题
A.1mm B.1.5mm C.2.5mm D.3mm
A.T+(0~3) B.T+(3~6) C.t/2≤K≤t D.t/3≤K≤2t
A.75% B.60% C.80% D.85%
A.30 B.40 C.20 D.25
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