What was the main disadvantage of vacuum tubes?

A. They were larger in size

B. They consumed a lot of electricity

C. They produced heat and often burned out

D. The operation cost was high

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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  22. A small or intelligent device is so called because it contains within it a
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  25. The operating speed of third generation computer was
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  27. Cursor is a
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