pH值是如何影响离子交换分离的？

下列各组离子，在强碱性溶液中可以大量共存的是（　　）

A．Na⁺、AlO₂^-、Cl^-、S^2-

B．Na⁺、K⁺、NH₄⁺、Ba²⁺

C．Al³⁺、K⁺、Cl^-、CO₃^2-

D．SO₃^2-、NO₃^-、SO₄^2-、HCO₃^-

某公司依法发出收购要约收购某上市公司的股票，进行上市公司收购活动，在该收购公司发出的收购要约期满时，当下列哪种情况出现时，其余仍持有被收购公司股票的股东，有权向收购人以收购要约的同等条件出售其股票，收购入应当收购

A．该上市公司因不符合上市条件被终止上市时

B．收购人持有的股份达到已发行股份的百分之九十时

C．收购人持有的股份达到已发行股份的百分之九十五时

D．收购人持有的股份达到已发行股份的百分之八十时

呼吸道不仅仅是气体进出肺的通道，它还能对吸入的空气进行处理，对吸进肺部的气体起到_____________、__________和_________的作用。目前流行的“甲型H1N1流感”是呼吸道传染病，预防“甲型H1N1流感”我们应该做到______________（任意答一条）。

红细胞描述错误的是（）。

A.红细胞是血液中数量最多的细胞

B.成熟红细胞有细胞核，呈双面凹圆碟形

C.红细胞悬浮于血浆中不易迅速下沉

D.红细胞可塑性变形

E.其主要功能是运输O₂和CO₂，缓冲血浆pH

Some consumer researchers distinguish (1) "rational" motives and "emotional" (or "non-rational") motives. They use the term "rationality" (2) the traditional economic sense that assumes (3) consumers behave rationally when they carefully consider all alternatives (4) choose those that give them the greatest utility (i.e., satisfaction). (5) a marketing context, the term "rationality" implies that the consumer selects goods based (6) totally objective criteria, such (7) size, weight, price, and so on. "Emotional" motives imply the selection of goods (8) to personal or subjective criteria—the desire (9) individuality, pride, fear, affection or status.
The assumption underlying this distinction is (10) subjective or emotional criteria do not maximize utility or satisfaction. (11) , it is reasonable to assume that consumers always attempt to select alternatives that, (12) their view, serve to maximize satisfaction. Obviously, the assessment of satisfaction is a very personal process, based (13) the individual’s own needs as (14) as on past behavioral, social, and learning experiences. What may appear (15) irrational to an outside observer may be perfectly rational (16) the context of the consumer’s own psychological field. For example, a product purchased to enhance one’s self-image (such as a fragrance) is a perfectly rational form of consumer behavior. (17) behavior did not appear rational to the person who undertakes it (18) the time that it is undertaken, obviously he or she would not do it. (19) the distinction between rational and emotional motives does not appear to be warranted.
Some researchers go so far (20) to suggest that emphasis (21) "needs" obscures the rational, or conscious, nature of most consumer motivation. They claim that consumers act consciously (22) maximize their gains and minimize their losses; that they act not (23) subconscious drives but from rational preferences, (24) what they perceive to be (25) their own best interests.