【单选题】80C51 单片机的中断系统具有( )个计数器 / 定时器中断。
【单选题】Often ______ not to be late for class.
C.
the teacher have asked Tom
D.
did the teacher ask Tom
【单选题】80C51 单片机的中断系统具有( ) 个外部中断。
【单选题】在双角钢作为杆件的桁架结构中,为避免节点区域的焊缝过于密集使材料变脆,可通过控制杆件之间的净距离来实现,一般杆件之间的净距离为()
【判断题】C语言编译系统把程序中的printf 与 Printf视为相同的标识符。
【单选题】80C51 单片机的中断系统具有( ) 个外部中断。
【简答题】You won ’ t be late for class next time.( 变成祈使句 ) _________ ________ late for class next time.
【单选题】—You'd better hurry, or we'll be late for the plane. —Don't worry. The plane will in two hours. [ ]
【单选题】Why is the woman worried?
A.
She will be late for the dinner.
B.
She won't have time to give their clients a tour of the city.
C.
She will not have enough time to go sightseeing.
D.
She does not like flying.
【单选题】下面关于画笔工具的描述哪个是正确的 ______。