A.只有机械能守恒
B.只有动量守恒
C.只有对转轴O的角动量守恒
D.机械能、动量和角动量守恒
[单选题]A.只有机械能守恒B.只有动量守恒C.只有对转轴O的角动量守恒D.机械能、动量和角动量守恒
[单选题]A.To prove their popularity around the world.B.To reveal the public’s fear
[单选题]A.programsB.expertsC.devicesD.creatures
[单选题]A.programsB.expertsC.devicesD.creatures
[单选题]A.To prove their popularity around the world.B.To reveal the public’s fear
[多选题]下列关于该公文的说法,错误的有()。A.该公文文种应为通报B.该公文行文方向为下行文C.该公文采用“分条列项”的结构形式D.该公文表述方式以议论为主、
[多选题]下列关于该公文格式的说法,正确的有()。A.数字标注不规范B.发文字号表述不规范C.序数词格式有误D.落款没有标注发文机关的规范全称E.引用上级单位公
[单选题]A.BlVB.BlvsinaC.BlvcosaD.0
[单选题]A.=0B.≠1C.≠2D.λ≠0且λ≠1