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【判断题】
字符串中的trim方法能够去除字符串的所有空格。A.
正确
B.
错误
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举一反三
【单选题】低频信号发生器的频率范围为( )。
A.
20Hz ~ 200KHz
B.
100Hz ~ 1000KH
C.
200 Hz ~ 2000KHz
D.
10 Hz ~ 2000K Hz
【简答题】低频信号发生器用来产生频率为( )Hz~( )MHz的低频正弦信号。高频信号发生器用来产生频率为( )KHz~( )MHz的高频正弦信号。
【单选题】Which of the following statements is NOT true about King Alfred of Wessex ?
A.
Alfred’ s written laws were like comprehensive common law.
B.
In fighting against the Danish invasions of the ninth century he beg a n to unif y the Anglo-Saxon peoples into the single kingdom of England .
C.
He attach ed great importance to justice and reviewed disputed decisions made by his subjects.
D.
Alfred’ s written laws were an attempt to impose uniformity in certain limited fields such as legislation.
【单选题】低频信号发生器的频率范围为( )。
A.
20HZ ~200KHZ
B.
100HZ ~1000KHZ
C.
200HZ ~2000KHZ
D.
10HZ ~2000KHZ
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