四川长虹千股千评价:What is sheet current density? How does it relate to current density J?

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How do we calculate it?
What is sheet current density? How does it relate to current density J? what is done is done what is oicq? What is WINS？ What is 对冲基金? What is photoshop? what is pk? what is BT? what is love kin is what???