【单选题】下列哪个是一种设计程序的技术,它采用自顶向下、逐步求精的设计方法和单入口单出口的控制结构。
【单选题】I did my homework _____ 12 o'clock yesterday. [ ]
【单选题】It _____ he _____ his office. [ ]
A.
was until the clock struck 12 when; didn’t leave
B.
wasn’t until the clock struck 12 when; leave
C.
wasn’t until the clock struck 12 that; leave
D.
wasn’t until the clock struck 12 that; left
【单选题】一种以家庭为对象而实施的心理治疗方法是:
【单选题】When must the woman leave her room?
B.
At 5 o'clock tomorrow afternoon.
C.
At 2 o'clock tomorrow afternoon.
【单选题】It was 12 o'clock ______the plane took off.
【简答题】发电机定子绕组单相接地时,故障相对低电压等于(),中性点对地电压()。