如果力学系统在有限空间中运动,势能是坐标的齐次函数,则动能和 势能的时间平均值之间存在关系,称为位力定理
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用“L”符号代替的偏旁是下列哪几项?()
A. 冫
B. 氵
C. 言
D. 疒
按照最新规定，因营改增，“营业税金及附加”科目须改为“税金及附加”科目。（）
A. 对
B. 错
The young men began to enlist for ________.
A. fun in the war
B. the war before it was too late
C. the democracy before the war ended
D. the Victorian gentility after the war
“The Sad Young Men” actually refers to _________.
A. the lost generation
B. the angry young men
C. Beat generation
D. the war profiteers
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