题目内容

切削用量中背吃刀量对刀具磨损的影响最大。。切削用量的三要素有，切削速度、进给量和背吃刀量( )

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.切削用量中对切削热影响最大的是切削速度（）

切削用量中对切削力影响最大的是进给量（）

1．The development of electronics has had three important steps:（）, （）and（）.

A. computer
B. vacuum tube
C. transistor
D. integrated circuit

2．The first application of electron tubes were in（）.

A. radio
B. television
C. communication
D. broadcasting