出自:西安交通大学专业英语

A computer.s microprocessor only understands. in binary form.A high-level languagesB, machine languagec. human languagesD. assembly language
An expansion slot is a long. narrow socket on the motherboard into which you can plug___ A an expansion cardB. a modem c. a network cardD, a sound card
ON-OFF information can be represented by__ signal.A. a digitalB, an analogc. a discreteD, a control
Resistors are. elements. A. passiveB. active c. independent sourcesD. dependent sources
The algebraic sum of all votages around a loop is_ A. zero B. indefinite valuec. sum of voltage risesD. sum of voltage drops
The system.s characteristic equation can be used to determine. of a linear time-invariant system. A the stability B. magnitude of the steady-state errorc. the controllabilityD. the observability
The transformer is a straightforward application of Faraday.s___ Law. A. Ohm.sB. Electromagnetic Inductionc. Kirchhoff.s CurrentD. Kirchhoff.s Voltage
The unit of logarithm of the magnitude of a transfer function is__A. radians per secondB. voltsc. decibelD. octaves
__ carries data out to speakers and headphones, or back from a microphone.A. A graphics cardB. A modem .c. A network cardD. A sound card
___ is used as coolant in light-water reactors.A Gas B. Organic compoundc. Molten saltD. Water
The relation results in_A. nullB. identityc. indefinite valueD, zero
A computer printer is_ device that produces computer-generated text or graphical images on paper.A an inputB, an outputc, a storage D, a data processing
A D/A is a device that can convert a digital signal to the equivalent_A. digital formB, numerical formc. binary formD, analog form
Delphi belongs to_ A. low-level programming languageB. high-level programming language c. a programming language connected with the computer hardware behaviorD. an assembly language
In a coal-fired power plant, an electrostatic precipitator is used to remove__ from the combustion gases. A. solid particleB, co c. water vapour
In cogeneration (热电联产，热电联供 ) systems, the overall energy effincies are raised by_.A, important the combustion processB. providing thermal energy to the customersc. raising the steam temperatureD. reducing emissions
In North American_ is adopted as standard frequency in electric power system.A.25HzB.50Hzc.60HzD, 125Hz
The Buck(降压式变换器) isa___ converter.A. voltage step-upB. current step-downc. current step-upD, resistance
The DC-DC converts__ input to_ output.A. direct current, alternating currentB. direct current, direct currentc. alternating current, alternating currentD. alternating current, alternating current
The generator voltages are usually stepped up to the transmission voltage level by__.A. series capacitorR. parallel reactors c, step-up transformersD, step-down transformers
The hydropower is well suited for switching according to_ command to meet changing power needs.A. a consumer.sB, a user.sc. a dispatcher.sD. an operator.s
The precision of ADC ( analog-to-digital conversion ) is determined by___.A. its speedB. its gainc. the accuracy of the reference voltageD. the number of binary bits
When an induction motor with 10 poles is supplied by 50Hz three-phase ac power source, the synchronous revolutions per minute is__ (Synchronous r/min= 120 f/p)A, 1000 .B.900c.700D, 600
A computer.s microprocessor only understands high-level language
A digital computer controlled system is only designed for discrete variable
An output device, such as a keyboard or mouse, gathers input and transforms it into a series of electronic signals for the computer.
Electron will flow through a conductor from the positive terminal to the negative terminal
In China alternating current is usually generated at 60Hz
The commutator can change current direction in the conductor
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