The heat that is produced by burning garbage can be used to______.

A． make electricity

B． make energy source

C． boil water

D． save coal

[单选题]The burning of the fuel adds more heat to the air charge, causing it to expand and force the engine piston to do work on the crankshaftWhat does “it” mean in this sentence?（）A . the burningB . the fuelC . the air chargeD . the engine pisto

[单选题]In the experiment, the burning inside the bottle can___.A． equalize the air pressure inside and outsideB． make a seal in the neck of the bottleC． finish up the oxygen inside the bottleD． produce more oxygen inside the bottle

[单选题]_______________[A] created [B] produced [C] contributed [D] preferred

[单选题]how is a current produced ?

[单选题]When the fuel oil is burning in the combustion chamber, it _____.A．gives up large amount of heatB．gives off large amount of heatC．gives up large amount of steamD．gives off large amount of steam

[单选题]When the fuel oil is burning in the combustion chamber, it （）.A . gives up large amount of heatB . gives off large amount of heatC . gives up large amount of steamD . gives off large amount of steam

[单选题]Since the burning or combustion takes place within the engine itself, the engine is known as （）.A . a fire -tube boilerB . an internal combustion engineC . an external combustion engineD . an internal combustion generator

[单选题] Document outputs are produced on （71） , devices that produce text or images on paper.（71）A． display and keyboardB． mouse and keyboardC． scanners and plottersD． printers and plotters

[单选题]D．ocument outputs are produced on(75) , devices that produce text or images on paper.A．mouse and keyboardB．scanners and plottersC．display and scannersD．printers and plotters

[单选题]D．ocument outputs are produced on(71), devices that produce text or images on paper.A．display and keyboardB．mouse and keyboardC．scanners and plottersD．printers and plotters