单项选择题

【 95.流过导体单位截面积的电流叫电流密度，其单位为（）

A.安培
B．安培/平方米
C．安培/平方毫米

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单项选择题

I_______ this letter to thank you for you warm hospitality accorded to me and my delegation during our recent visit to your beautiful country.

A、am writing
B、write
C、wrote

热加工车间进风口布置得越低越好。

答案：错误