【判断题】晶体三极管本质上是一个电流控制电流源器件。
【单选题】下列说法中不正确的是( )
D.
稳压二极管在稳压状态时,它的PN结处在反向击穿状态
【判断题】心尖部第一心音增强并呈拍击样,主要见于二尖瓣狭窄。( )
【单选题】心尖部第一心音增强并呈拍击样,主要见于:
【单选题】A good artist, like a good engineer, learns as much from ________ his success.
【单选题】为了做好( )管理,有效地沟通甚至是个人解释是必需的,这样才能帮助顾客理解他们所得到的价值。
【单选题】A good manager identifies the interest of his employees _____ his own .