An electric heater built into some smaller diesel engines is used to ().
The main purpose of an electric space heater installed in a large AC generator is to ()
Any electric motor can be constructed to be().
Electric insulation is made of organic substances and so gradually () with age.
Which of the following electric motors would be the safest and most reliable to use on the main deck of a vessel in foul weather conditions?()
When would you ground an electric hand tool?()
The electric shaver _____ before it can be used.
Basal electric rhythm(BER)在人胃为()次/分,十二指肠()次/分。回肠末端为()次/分。
Most often () is attached to the engine-propeller shaft for efficient electric power generation.