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西安交通大学专业英语
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
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