问答题

“洋碱”是旧时对哪种日用品的称呼？

答案：正确答案：肥皂

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Why did the dog stand out here in the cold

A．He enjoyed the snow in winter.
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单项选择题

Which of the following statements about the basic electric rhythm of the smooth muscle of the digestive tract is wrong ()

A．It is related to the periodic activity of electrogenic sodium pump
B．It is produced autonomously
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E．Is the control wave of smooth muscle contraction