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【简答题】
异步电动机因为转子的转速n总是小于旋转磁场的转速n0，因此我们用（）（S）来表示转子转速n与磁场转速n0相差的程度。
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举一反三
【简答题】A．Just after a new President is elected. B．Just before Congress takes any short break. C．When Congress has just ended an entire session. D．Anytime during a session of Congress.
【单选题】The internal temperature of a large desert mammal is lowest______.
A.
just before sunrise
B.
just after sunset
C.
just after drinking
D.
in the middle of the day
【单选题】Under the System of Jun Tian (均田制), land was distributed by _______.
A.
family
B.
head
【多选题】Jing Tian Zhi (井田制) is characterized as _________.
A.
the earliest national land policy in China’s history
B.
mostly practiced in the Zhou dynasty
C.
a system practiced nation-wide
D.
a layout of a “井田”.
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