【多选题】二极管内部是一个PN结,关于PN结说法正确的是( )
【简答题】PN结是一个二极管,它具有______。
【单选题】We shall credit your account ________ the invoice value of the returned goods and the cost of return freight.
【单选题】出现月经是由血液中什么激素的浓度急剧下降所致( )
【判断题】晶体二极管由两个PN结构成,二极管包含一个PN结,因此可以用两个二极管反向串联接成一个晶体三极管使用。
【单选题】Upon __ of your letter of credit, we shall arrange shipment immediately.
【简答题】After
the said license is approved, we shall establish a letter of credit in your
favor.
【简答题】() receipt of your letter of credit, we shall make shipment immediately.