单项选择题

When healthy adults are awake, quiet, and their eyes are closed, which wave can be recorded by electroencephalogram?
A、α Wave
B、β Wave
C、θWave
D、δWave

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单项选择题
关于原始消化管的描述，哪项错误( )
A.为内胚层形成的一条纵行管道
B.前肠头端以口咽膜封闭
C.后肠尾端以泄殖腔膜封闭
D.中肠的背侧与卵黄蒂相连
多项选择题
When you want to show ________ in your speech, you are recommended to use low pitch.A.calmnessB.mourningC.angerD.lethargy
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