超星 - L1-课后练习 - 查题吧

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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

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

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

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

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

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

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

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5．The first electronic computer included 18,000（）and used 200 kilowatts of electrical power.

A. transistors
B. vacuum tubes
C. ICs
D. electronic components

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6．A transistor is a semiconductor device used to（）electronic signals.

A. produce
B. amplify
C. reduce
D. switch

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7．In most applications, vacuum tubes have been replaced by（）and other semiconductor devices.

A. electron tubes
B. transistors
C. silicon
D. germanium

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8．The most advanced（）are the microprocessors, which control everything from computers and cellular phones to digital microwave ovens.

A. semiconductors
B. wafers
C. transistors
D. integrated circuits

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