【多选题】对于本征半导体而言,其正确的说法是( )。
B.
在外电场的作用下,可以形成电子电流和空穴电流。
C.
在本征半导体中,自由电子和空穴总是成对出现,同时又不断复合。
【单选题】幼儿急性上呼吸道感染最常见的病因是()。
【判断题】受要约人可以在要约的有效期限内以开立信用证的行为来表示承诺。( )
【判断题】Expense-preference behavior describes an approach where managers use the financial resources of the firm to provide them with personal benefits not needed to produce and sell the products. This behavi...
【判断题】Channel conflict occurs when retailers of products must compete on price and currency of inventory directly against the manufacturer, who does not face the cost of maintaining inventory, physical stor...
【简答题】他们的行动清楚地反映了他们的思想。(reflect)
【判断题】Channel conflict occurs when retailers of products must compete on price and currency of inventory directly against the manufacturer, who does not face the cost of maintaining inventory, physical stor...