【单选题】某体系存在 C. s ,H2O g ,C.O g ,C.O2 g ,H2 g 五种物质,相互建立了下述三个平衡: H2O g + C. s === H2 g + C.O g C.O2 g + H2 g === H2O g + C.O g C.O2 g + C. s === 2C.O g 则该体系的独立组分数 C. 为:
【判断题】JK触发器是在CP 脉冲下降沿进行状态翻转的触发器。()
【单选题】Oh, Jack, _________________ you gave us!
A.
How a pleasant surprise
B.
How pleasant a surprise
C.
What pleasant a surprise
D.
What pleasant surprise
【简答题】①下降沿触发的JK触发器,其输出Q与输AK连接,触发器初始状态为0,在CP脉冲作用下,输出Q的波形为图10.29中的波形( )。
【简答题】A.Short and unchanging. B.Pleasant and melodious. C.Melodious and complicated. D.Pleasant and changing.
【判断题】增值税扣税凭证是指增值税专用发票、海关进口增值税专用缴款书、农产品收购发票、农产品销售发票和税收缴款凭证。
【判断题】立放棱锥体表面上点的 H 面投影均为可见。
【单选题】— Oh, Rose. ______ you gave us! — Really?
A.
How a pleasant surprise
B.
How pleasant a surprise
C.
What pleasant surprise