【多选题】某平面任意力系向某点简化,其主矢及主矩都不为零,若适当选择简化中心,有可能存在
【单选题】平面任意力系向某点简化,其主矢、主矩皆不为零,下述说法中正确的是
C.
该力系既不能用一个力来平衡,也不能用一个力偶来平衡,而必须用一个力和一个力偶来平衡
【多选题】下列关于传动系统的特点,说法中正确的是( )。
【多选题】某平面任意力系向某点简化,其主矢及主矩都不为零,若适当选择简化中心,问能否使:
【判断题】伊丽莎白见到彭伯利后,有些懊悔自己没能做女主人。
【单选题】关于传动比,下列说法正确的是()
A.
主动轮转速比从动轮转速小,则该传动为增速传动
【单选题】关于动力转向系统下列说法正确的是
B.
动力转向系统要定期检查方向机油位及传输管路是否渗漏,方向机的固定螺栓,检查四轮定位情况
【多选题】某平面任意力系向某点简化,其主矢及主矩都不为零,若适当选择简化中心,则可能存在
【单选题】Inflation can occur even under conditions of full employment
A.
only if the central bank continues to inject money into the economy and the agents' expectations of inflation are supported by the bank's activities.
B.
only if the central bank continues to inject money into the economy.
C.
only if the central bank continues to withdraw money from the economy.
D.
only if the central bank continues to inject money into the economy and all agents expect that inflation will not occur.
E.
only if the central bank fails to inject money into the economy.