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
A. 对
B. 错
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