题目内容
在同样切削条件下,进给量f越小,则表面粗糙度Ra值越大。
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镗孔只能在钻孔的基础上进行,而不能对已铸或已锻的孔作进一步加工。
在车床上镗孔,若刀杆细长,容易出现锥形误差。
车削螺纹时,当车床纵向丝杠的螺距能被工件螺距整除时,则多次走刀打开“对开螺母”,摇回大托板,也不会造成“乱扣”现象。
Fill in the blanks with the proper words.1. We stay in ____________ by e-mail.2. The students listened to the professor in ____________ silence.3.WhenIwentformyfirst____________forthisjobIarrivedextremelyearly4. We had to slightly ____________ the original design.5. Each ____________ leaf on the tree is different.6.Typing is considered by most employers to be a basic ____________.7. I want to ____________ to children that reading is one of life’s greatest treats.8. Our goal is to ____________ a new research centerin the North.9.How will the war ____________ on his generation?10. Laura’s ____________ about her weight.
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