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切屑与前刀面粘结区的摩擦是第Ⅱ变形区变形的重要成因

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未知题型
当切削塑性金属材料时，若切削速度较低，切削厚度较薄，则易发生后刀面磨损。
问答题
Nothing strikes us more hurtfully than failure. Especially, in the case of people with poor self-esteem and low self-confidence, the pain and fear__6___ with failure is much more serious, damaging and debilitating. It can have a lasting and crippling__7___. Failure prevents many from being true __8___ their potential and realizing their cherished dreams.
Since success and failure are __9___from our lives, as long as we are engaged in some professional activity or the other, we have to find healthy ways to __10___with our failures to keep working at our goals and realize our dreams.
You may not have the confidence to admit, __11___you have the ability to deal with any failure or problem in your life. Confidence is the key. If you have __12___ in yourself and in your abilities, you can overcome any failure in your life. __13__tough it may be, no problem is insurmountable to human intelligence. You deal with every failure in a positive, intelligent and __14__ way. You have the power, you have the skills and you have strength to __15___your failures and minimize their impact  upon your life and actions, just as you can manage any situation in your life, with right effort and right frame of mind.
判断题
气门间隙过大时,发动机在热态下可能发生漏气,导致发动机功率下降。
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