【名词&注释】
胃穿孔(gastric perforation)、孤束核(nucleus tractus solitarius)、迷走神经背核(dorsal nucleus of vagus nerve)、神经核(nucleus)
[单选题]腹部叩诊鼓音区扩大见于( )
A. 胃穿孔
B. 胃肠胀气
C. 足月妊娠
D. 人工气腹
E. 以上都不对
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举一反三：
[单选题]不属于副交感核的脑神经核(nucleus)是( )
A. 上泌涎核
B. 下泌涎核
C. 孤束核
D. 迷走神经背核
E. 动眼神经副核
[单选题]According to this passage, which of the following is true?
A. The Negroes came to North America in order to work for the earliest immigrants.
B. The Negroes also belonged to the earliest immigrants to the North America.
C. The Negroes were brought to America by chance.
D. The Negroes didn't win freedom until now.
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