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单项选择题
At what points are the function
At what points are the function 
continuous?
A．Discontinuous at odd integer multiples of 
, but continuous at all other x.
B．Continuous at odd integer multiples of, but discontinuous at all other x.
C．Continuous at even integer multiples of, but discontinuous at all other x.
D．Discontinuous at even integer multiples of, but continuous at all other x.
, but continuous at all other x.B．Continuous at odd integer multiples of
, but discontinuous at all other x.C．Continuous at even integer multiples of
, but discontinuous at all other x.D．Discontinuous at even integer multiples of
, but continuous at all other x.
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问答题
根据《建设工程施工现场供用电安全规范》（GB50194-2014）规定，关于轨道式塔式起重机接地装置的设置,说法正确的有（）。
答案：
A.塔式起重机电源进线的保护导体(PE)应做重复接地，塔身应做防雷接地；
B.轨道的接头处做搭接，两头轨道端部应...
B.轨道的接头处做搭接，两头轨道端部应...
