问题
单项选择题
为减少镗孔时的振动，减小变形，镗孔时应尽量（）。
A.减小主偏角
B.增大镗刀后角
C.提高切削用量
D.提高工艺系统刚度
答案
参考答案：D
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为减少镗孔时的振动，减小变形，镗孔时应尽量（）。
A.减小主偏角
B.增大镗刀后角
C.提高切削用量
D.提高工艺系统刚度
参考答案：D
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| Mrs. Brown lived alone in a small flat. She was old and didn't like 1 at all. So she was very 2 when the young man or woman in the flat moved out. A new young man moved 3 , and Mrs. Brown thought. "Well, he looks 4." But at three o'clock the next morning, she was woken up by the barking of a dog. "I've 5 heard the barking here before," she thought." It 6 be the young man's dog." So she telephoned the young man at once, 7 some unpleasant things to him, rang off the telephone and went to bed 8 he could answer. The next day Mrs. Brown's telephone rang at 9 hour of morning, and she got out of bed and answered, the 10 said to her, "I haven't got a dog, madam." | |||
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