Sir Roger Bannister received higher education.
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On May 6, 1954, Bannister established a world record, and this record was not bettered for a long time.
A. 对
B. 错
After retiring from athletic competition,Bannister became a lawyer.
A. 对
B. 错
Sir Roger Bannister was knighted 21 years after heretired.
A. 对
B. 错
下列说法正确的是：
A. 只有非保守力做功，才能使机械能发生变化。
B. 功能原理与动能定理并无本质不同，只是功能原理中引入了势能而无需考虑内保守力的功。
C. 保守力做功会引起质点系动能的改变。
D. 保守力做功不会改变质点系的机械能。
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