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【多选题】
对称三相绕组流过对称三相电流时气隙合成磁动势基波的性质，以下正确的是（ ）。A.
三相合成磁动势的基波是一个波幅恒定不变的旋转波。
B.
旋转磁动势基波的电角速度等于交流电流角频率ω，转速为同步转速n1。
C.
旋转磁动势由滞后相电流所在的相绕组轴线转向超前相电流所在的相绕组轴线。
D.
改变电流相序，不改变旋转磁动势方向。
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举一反三
【单选题】The people of the coral island nations are unable to do anything substantial about the problem of global warming.
A.
Right
B.
Wrong C Not mentioned
【单选题】What are the people on the island doing?
A.
Preserving the island and mountains.
B.
Teaching the whistling language in schools.
C.
Asking people t o move to the mainland of Spain.
D.
Encouraging people to use modern ways of communication.
【单选题】The people of the coral island nations are unable to do anything substantial about the problem of global warming.
A.
Right
B.
Wrong
C.
Not mentioned
【简答题】请回答针灸治疗呕吐的主穴及寒吐者的配穴。
【简答题】The island continent of Australia offers an enormous array of scenic variety and you can take the opportunity of enjoying just about every adventure you've ever dreamed possible.
【单选题】治疗呕吐的主穴是
A.
中脘、天突、胃俞、足三里
B.
中脘、内关、足三里、公孙
C.
中脘、合谷、足三里、胃俞
D.
中脘、天枢、足三里、内关
E.
中脘、膻中、足三里、合谷
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