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定心孔 dìngxīn kǒng
met. centring hole
railw. centering hole
tech. internal point
螺丝攻定心孔 dìngxīn kǒng
construct. internal point
螺丝攻的定心孔 dìngxīn kǒng
construct. internal centre
定心孔: 19 phrases in 8 subjects
Automobiles1
General2
Mechanic engineering1
Mechanics1
Metallurgy6
Plastics1
Shipbuilding4
Technology3

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