To produce one pound of honey,a colony of bees must fly a distance_______to twice around the world.

单选题

To produce one pound of honey,a colony of bees must fly a distance_______to twice around the world.

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单选题

In order to produce one gram of mass, it will take one megawatt unit of nuclear power plant to work for several _____.

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单选题

It is perfectly _________ to produce electricity without creating pollution.

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单选题

To produce accurate results, the equipment must be manufactured to very ________ specifications.

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单选题

One ampere is equal to ____.

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