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【单选题】
晶闸管触发电路中,若改变 的大小,则输出脉冲产生相位移动,达到移相控制的目的。A.
同步电压
B.
控制电压
C.
脉冲变压器变比
D.
偏置电压
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举一反三
【单选题】import time scale = 10 print("------执行开始------") for i in range(scale+1): a = '*' * i b = '.' * (scale - i) c = (i/scale)*100 print("{:^3.0f}%[{}->{}]".format(c,a,b)) time.sleep(0.1) print("------执行结束...
A.
当i=2是，*被赋值2次
B.
当i=2是，.被赋值8次
C.
当i=2是，c=40
D.
当i=2是，c=20
【单选题】启动一个前台线程import threadingimport timeimport randomdef reading(): for i in range(5): print("reading",i) time.sleep(random.randint(1,2))r=threading.Thread(target=reading)__________________r.start()...
A.
r.setDaemon(True)
B.
r.setDaemon(true)
C.
r.setDaemon(False)
D.
r.setDaemon(false)
【判断题】import threadingimport timelock=threading._RLock()words=["a","b","d","b","p","m","e","f","b"]def increase(): global words for count in range(5): lock.acquire() print("A acquired") for i in ...
A.
正确
B.
错误
【简答题】Under CMR convention, the carrier is responsible for loss of or damage to the goods occurring between the time he takes over the goods and the time of delivery as well as for any delay in delivery. （ ...
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