切削力常分解到三个相互垂直的方向上:__________力与主切削刃上某点的切削速度方向一致;与工件轴线平行的为__________力;与工件半径方向一致的是__________力。( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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