当外力矩为零时 质点动量矩守恒。例如行星绕太阳旋转 电子绕原子核旋转等 因为种种原因外力矩为零
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当外力矩为零时，质点动量矩守恒。例如行星绕太阳旋转，电子绕原子核旋转等，因为种种原因外力矩为零，故质点动量矩守恒。 When the moment of external force is zero, the momentum moment of mass is conserved. For example, Planets revolve around the sun, Electrons revolve around the nucleus, etc., because of various reasons the moment of external force is zero, so the momentum moment of mass is conserved.
A．不对； False;
B．对 True;
C．0
D．0
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对