题目内容

切削用量中对切削力影响最大的是进给量（）

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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

3．（）had surpassed radio for home use and entertainment.

A. Communication
B. Television
C. Video camera
D. Personal computer

4．Using echoes of radio microwaves, radar can detect（）.

A. a car
B. a ship
C. a plane
D. rain