单项选择题
A.1%-2% B.2%-3% C.3%-4% D.4%-5%
A.8N/s B.10N/s C.15N/s D.20N/s
A.1.8±0.05mm B.2.0±0.05mm C.2.2±0.05mm D.2.4±0.05mm
A.5kN B.10kN C.15kN D.20kN
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