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[单选题]
梯形螺纹车刀的进给方向后角为()
A.(3°~5°)+ψ
B.(3°~5°)-ψ
C.(5°~8°)+ψ
D.(5°o~8°)-&psi
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A.(3°~5°)+ψ
B.(3°~5°)-ψ
C.(5°~8°)+ψ
D.(5°o~8°)-&psi
第7题
A.AVERAGE(A3:C3,B5:D5,C7:E7)
B.AVERAGE(B3:D3,C5:E5,D7:F7)
C.AVERAGE(C1:E1,D3:F3,E5:G5)
D.AVERAGE(B2:D2,C4:E4,D6:F6)
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