Some materials(物质) have a very high resistance(电阻), because of which they can be used as insulators(绝缘体) to prevent the leakage of current.
有些物质的电阻很高,因此可以用作绝缘体来防止漏电。
举一反三
- Materials ____ which current can flow are called conductors.
- Which of the following expressions is correct? A: Carbonaceous materials are the most widely used cathodes because they are non-toxic and provide good stability. B: Carbonaceous materials are the most widely used cathodes because they are non-toxicity and good stability. C: Carbonaceous materials are the most widely used cathodes due to their non-toxicity and high stability. D: Carbonaceous materials are the most widely used cathodes due to non-toxic and highly stable.
- Which materials can be used for its different parts?
- Plane can’t fly very high because ________.
- Which one does not belong to the advantages of power electronic devices? A: When the device turns off, it can withstand high terminal voltage and the leakage current is approximately zero B: When the device turns on, it can carry a large current, and the terminal voltage is approximately zero C: The device can work in amplified state D: The current can only flow through in one direction
内容
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Pesticides must be burned at very high temperature because high temperatures can limit ______.
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Materials ____ which current can flow are called conductors. A: A.through B: B.with C: C.at D: D. of
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You should decide which types of supporting materials you need. We have 7 types of materials that can be used in speeches: Personal experiences,Common knowledge,Direct observation, Examples, Documents,Statistics,Quotation.
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Some writers are keen on playing with words, which can be very effective. ( )
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All the words in a language can be used to refer , but only some have sense.