How to produce ultrasound wave?
A: negative piezoelectric effect of transducer
B: Piezoelectric effect of transducer
C: Thermal effect of transducer
D: The magnetic effect of transducer
A: negative piezoelectric effect of transducer
B: Piezoelectric effect of transducer
C: Thermal effect of transducer
D: The magnetic effect of transducer
举一反三
- 下列哪个句子最符合科技英语写作规范？ A: The loudspeaker, an electroacoustic transducer, converts audio-frequency power into acoustic power. B: The loudspeaker; an electroacoustic transducer; converts audio-frequency power into acoustic power. C: The loudspeaker—an electroacoustic transducer, converts audio-frequency power into acoustic power. D: The loudspeaker—an electroacoustic transducer; converts audio-frequency power into acoustic power.
- A<br/>piezoelectric crystal is used to produce the ultrasound waves. What<br/>kind of ultrasound is produced? () A: Pressure<br/>wave ultrasound B: Electrical<br/>wave ultrasound C: Sound<br/>wave ultrasound D: Simple<br/>ultrasound
- According to the passage, to do the "effect to effect" reasoning is to reason _____. A: from cause to effect B: from effect to cause C: from effect to effect and on to cause D: from effect to cause and on to another effect
- The new law has come into _____; surely it will have _____on industry of the country. A: affect; an effect B: effect; affect C: effect; an effect D: an effect; an effect
- The new tax law______from next May. A: carried into effect B: puts into effect C: takes effect D: has effect