问题：
[单选题]Which of the following statements of vacuum tube is NOT true? ( )
A It had an internal power heater.
B Its life can reach millions of hours.
C It is bulky.
D It gave off heat.
[单选题]Which of the following statements of vacuum tube is NOT true? ( )
A It had an internal power heater.
B Its life can reach millions of hours.
C It is bulky.
D It gave off heat.
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