【多选题】下列 关于等势面的说法正确的是
A.
沿电场线方向,电势降低;电势降低的方向就是电场的方向
C.
在电场中将电荷由a点移到b点,电场力做功为零,则该电荷一定是在等势面上运动
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【单选题】施工成本控制要以( )为依据,围绕降低工程成本这个目标,从预算收入和实际成本两方面,努力挖掘增收节支潜力,以求获得最大的经济效益。
【单选题】施工成本控制要以( )为依据,围绕降低工程成本这个目标,从预算收入和实际成本两方面,努力挖掘增收节支潜力,以求获得最大的经济效益。
【单选题】关于等势面的说法正确的是( )
A.
电荷在等势面上移动时不受电场力的作用,所以电场力不做功