［A］devices ［B］instruments ［C］readers ［D］examiners

[单选题]Which devices are instruments of interpretation and communication between humans and computers?A．main memoryB．input/output devicesC．CPUD．hard disk

[名词解释] 金融工具（Financial Instruments）

[单选题]Telecommunications stand for devices and systems that transmit electronic or optical signals across long distances. Telecommunications enables people around the world to contact one another, to access information instantly, and to communicate from re

[单选题]Which of the following devices is a common basic element with nearly all mechanical governors?A．Power pistonB．Control rackC．Weights acted on by centrifugal forceD．Isochronous（同步的）droop spring

[单选题]Electrically operated safety devices on auxiliary diesel engines function to stop the engine by （）.A . increasing the volume of intake airB . shutting off the fuel supplyC . increasing the engine back pressureD . over-speeding the engine

[单选题]Which of the following devices is common to both mechanical and hydraulic governors?（）A . Direct linkage between the ball-head and fuel rackB . A servomotorC . A compensating deviceD . Flyweight

[单选题]Which of the following devices is a common basic element with nearly all mechanical governors?（）A . Power pistonB . Control rackC . Weights acted on by centrifugal forceD . Isochronous droop spring

[单选题]Which of the listed devices may be used as a digital device?A．variable resistorB．diodeC．strain gaugeD．thermistor

[单选题](71) devices are interface of man and machine.(71) A． I/OB．MemoryC．DiskD．Printer

[单选题]Most electronic devices of this kind，（）manufactured for export，are tightly packed.A . that areB . as areC . which isD . it is