Most field sprinklers use a rotating sprinkler head of the general type.
大部分田间喷灌采用通用的旋转式喷头。
Rotating magnetic field is an important content for teaching of electrical engineering.
旋转磁场是电机理论教学中的重要教学内容。
They are caused by the counter-rotating waves set up in the earth's electric field.
他们是导致在地球电场上形成逆向旋转波动的原因。
They are caused by the counter-rotating waves set up in the earth's electric field.
他们是导致在地球电场上形成逆向旋转波动的原因。
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