According to the definitions of grads, divergence and rotation, the expression in spherical coordinate system is given from the point of physics.
据梯度、散度、旋度的定义，用物理的方法给出了在球坐标系中的表达式；此方法也可以推广到其它的正交曲面坐标系中。
Then the control system of the bus was studied and a mode of control in grads was proposed.
然后讨论了燃料电池电动客车的控制系统，提出了分级控制的方案？
Then the control system of the bus was studied and a mode of control in grads was proposed.
然后讨论了燃料电池电动客车的控制系统，提出了分级控制的方案？
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