Brisbane Associates has revealed that several customers of ______ have recently moved to rival brokerage firms.
A. them
B. their
C. theirs
D. themselves
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肺气肿是指肺内残气增多，持续扩张性病变，主要累及
A. 气管和左、右支气管 B．终末细支气管
B. 呼吸性细支气管及远端肺组织
C. 肺内细小支气管
D. 局限于肺泡
镰刀状细胞贫血病是由于血红蛋白______。
A. β亚基氨基酸发生了单位点突变
B. α亚基氨基酸发生了单位点突变
C. β亚基氨基酸发生了多位点突变
D. α亚基缬氨酸发生了突变
肾上腺髓质激素分泌所受支配的神经纤维是______。
A. 交感神经节后纤维
B. 交感神经节前纤维
C. 副交感神经节后纤维
D. 副交感神经节前纤维
Goods that are returned ______ warranty should be accompanied by proof of purchase.
A. with
B. under
C. over
D. on
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