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【单选题】
以下关于交流接触器说法正确的是（）。A.
一般有三对主触头
B.
主触头安装在控制电路中
C.
辅助触头安装在主电路中
D.
线圈安装在主电路中
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举一反三
【单选题】The year of 776 BC is considered to be the founding date of the Olympic Games in ancient Greece. The Games lasted more than 11 centuries ______ they were banned in 393 A D.
A.
when
B.
after
C.
as
D.
until
【单选题】The world restarted the Olympic Games in 1896, but the restart of torch relay was later than that.
A.
Y
B.
N
C.
NG
【简答题】交流电周期用符号t表示。( )
【单选题】听力原文： The organizers of the Olympic Games in Beijing have marked the start of the year-long countdown to the event with an elaborate ceremony in Tiananmen Square. The exact moment the Games will begin...
A.
economic power
B.
celebration-planning skills
C.
national security
D.
artistic features
【简答题】MCS-51 系列单片机有两个中断优先级:分别是( )和( )。
【简答题】交流电流的有效值用小写字母'i'表示。()
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