【单选题】同步4位二进制减法计数器的借位输出方程是B=Q4ʹQ3ʹQ2ʹQ1ʹ,则可知B的周期和正脉宽度()。
【判断题】试样在标准测试环境中放置时间长短与最终测试性能无关
【简答题】逻辑分析题 4位同步二进制计数器74161的功能表如表所示,Q 3 为高位输出,C为与时钟同步的进位输出,进入1111状态且ENT=1时,由C端输出一个周期的正脉冲。 CP R_{bar{D}} bar{LD} ENP ENT Q 3 Q 2 Q 1 Q 0 varphi 0 varphi varphi varphi 0 0 0 0 ↑ 1 0 varphi varphi D 3 D 2 D 1 ...
【单选题】世界上第一条高速铁路采用的列控系统为( )
【判断题】汉语在塞尔的论证中所扮演的角色是非常“功能性”的,即塞尔只是借用“汉语”指涉任何他不懂的语言。( )
【单选题】en-route communication
A.
Instructed CCA102 to omit position report and maintain present level.
B.
Instructed CCA102 to check radio.
C.
Asked CCA102 to transmit information.
D.
Asked CCA102 to change frequency on 125.9.
【单选题】transfer communication en-route
A.
The pilot was establishing communication with Wuhan.
B.
The controller was telling the pilot his frequency/
C.
The pilot was going to be handed over to next controller.
D.
The pilot was making a position report.
【单选题】影响下列城市形成发展的社会经济因素中,符合资源—政治—宗教—交通顺序的是 [ ]