A3车翼子板内衬与轮胎摩擦产生异响的市场处理方案是，建议各服务站采取在轮罩与侧裙护板

常温下，将20mL0．1mol/L的HCl溶液逐滴加入到20mL0．1mol/LNa₂C₂O₄溶液中。已知NaHC₂O₄溶液显酸性，关于反应混合溶液的下列判断不正确的是

A．c(Na⁺)＞c(Cl^-)＞c(HC₂O₄^-)＞c(C₂O₄^2-)＞c(HC₂O₄)

B．c(Na⁺)+c(H⁺)=c(HC₂O₄^-)+2c(C₂O₄^2-)+c(OH^-)

C．c(Cl^-)=c(HC₂O₄^-)+2c(C₂O₄^2-)+c(HC₂O₄)

D．加水稀释时，溶液中c(OH^-)增大，其余离子浓度均减小

运用数据图表可以分析社会人口变化现象。据图1、图2回答1—2题。

1、图1是某地区育龄妇女平均生育子女数变化曲线图。若图中所示变化趋势持续下去，最可能出现的是[ ]

A．人口素质下降

B．人口老龄化

C．就业压力加大

D．劳动力成本下降

2、图2是新中国成立以来四个不同时期的人口年龄结构金字塔图，按时间先后排序正确的是[ ]

A．①②③④

B．①③④②

C．①②④③

D．①③②④

下列对储蓄存款的认识，正确的是（）

A、储蓄存款作为一种投资选择具有收益高的特点

B、储蓄存款可以随时存取，灵活方便，很受投资者的欢迎

C、储蓄存款比较安全，风险较低

D、储蓄存款由于收益很低，所以没有风险

Attempts to understand the relationship between social behavior and health have their origin in history. Dubos (1969) suggested that primitive humans were closer to the animals (1) they, too, relied’upon their instincts to stay healthy. Yet some primitive humans (2) a cause and effect relationship between doing certain things and alleviating (3) of a disease or (4) the condition of a wound. (5) there was so much that primitive humans did not (6) the functioning of the body, magic became an integral component ofthe beliefs about the causes and cures of heath (7) Therefore it is not (8) that early humans thought that illness was caused (9) evil spirit. Primitive medicines made from vegetables or animals were invariably used in combination with some form of ritual to (10) harmful spirit from a diseased body.

One of the. earliest (11) in the Western world to formulate principles of health care based upon rational thought and (12) of supernatural phenomena is found in the work of the Greek physician Hippocrates. The writing (13) to him has provided a number of principles underiying modern medical practice. One of his most famous (14) , the Hippocratic Oath, is the foundation of contemporary medical ethics.

Hippocrates also argued that medical knowledge should be derived from a (15) of the natural science and the logic of cause and effect relationships. In this (16) thesis, On Air, Water, and Places, Hippocrates pointed out that human well-being is (17) by the totality of environmental (18) : living habits or lifestyle, climate, geography of the land, and the quality of air, and food. (19) enough, concerns about our health and the quality of air, water, and places are (20) very much written in twentieth century.

18（）

A.elements

B.factors

C.components

D.deposits

简述先秦时期对辨证思索方法的归纳？