试分析用YT类硬质合金刀具材料切削 45钢时，切削速度v、进给量 f和切削深度ap 对刀具耐用度T的影响，选择切削用量时一般应如何选择？
试分析用YT类硬质合金刀具材料切削 45钢时，切削速度v、进给量 f和切削深度ap 对刀具耐用度T的影响，选择切削用量时一般应如何选择？
相关考题：
甲在生产作业期间，违反操作规程造成供电线路短路，引起火灾，烧毁厂房，致3名工人死亡，造成直接经济损失1千万元。甲的行为构成（）。A．失火罪 B．过失致人死亡罪 C．重大责任事故罪 D．失火罪和过失致人死亡罪
According to the passage, cancers may take some healthy steps other than ________.[A] stop smoking[B] exercise regularly[C] take non-fat diet[D] control their weight
根据下列文章，回答31～35题。During the past generation， the American middle-class family that once could count on hard work and fair play to keep itself financially secure has been transformed by economic risk and new realities. Now a pink slip， a bad diagnosis. or a disappearing spouse can reduce a family from solidly middle class to newly poor in a few months.In just one generation， millions of mothers have gone to work， transforming basic family economics. Scholars， policymakers， and critics of all stripes have debated the social implications of these changes， but few have looked at the side effect family risk has risen as well. Today's families have budgeted to the limits of their new two-paycheck status. As a result they have lost the parachute they once had in times of financial setback- a back-up earner （usually Mom） who could go into the workforce if the primary earner got laid off or fell sick. This “added-worker effect” could support the safety net offered by unemployment insurance or disability insurance to help families weather bad times. But today， a disruption to family fortunes can not longer be made up with extra income from an otherwise-stay-at-home partner.During the same period， families have been asked to absorb much more risk in their retirement income. Steelworkers， airline employees， and now those in the auto industry are joining millions of families who must worry about interest rates， stock market fluctuation， and the harsh reality that they may outlive their retirement money. For much of the past year. President Bush campaigned to move Social Security to a savings-account model， with retirees trading much or all of their guaranteed payments for payments depending on investment returns. For younger families， the picture is not any better. Both the absolute cost of healthcare and the share of it borne by families have risen-and newly fashionable health-savings plans are spreading from legislative halls to Wal-Mart workers， with much higher deductibles and a large new does of investment risk for families‘ future healthcare. Even demographics are working against the middle class family， as the odds of having a weak elderly parent- and all the attendant need for physical and financial assistance have jumped eightfold in just one generation.From the middle-class family perspective， much of this， understandably， looks far less like an opportunity to exercise more financial responsibility， and a good deal more like a frightening acceleration of the wholesale shift of financial risk onto their already overburdened shoulders. The financial fallout has begun， and the political fallout may not be far behind.第31题：Today\\\'s double-income families are at greater financial risk in thatA．the safety net they used to enjoy has disappeared.B．their chances of being laid off have greatly increased.C．they are more vulnerable to changes in family economics.D．they are deprived of unemployment or disability insurance.
Fairy stories are a means by which children's impulses may be ______.A) beneficially channeledB) given a destructive tendencyC) held back until maturityD) effectively suppressed
特殊侵权民事责任与一般侵权民事责任的构成要件的区别在于，它不要求A.客观上存在损害事实B.行为具有违法性C.违法行为和损害事实之间存在因果关系D.行为人主观上有过错请帮忙给出正确答案和分析，谢谢!
1949年9月21日，中国人民政治协商会议第一届全体会议通过了具有临时宪法的作用的A．《中华民国临时约法》B．《中华民国约法》C．《中国人民政治协商会议共同纲领》D．《中华人民共和国宪法》