阿司匹林（乙酰水杨酸）不良反应中，"剂量过大（5g／d）时，可出现头痛、眩晕、恶心、

结合下列图示装置，回答有关问题：

（1）写出图中标有字母的仪器名称：a               ；b                 

（2）上述装置可用于实验室制取和收集某些气体：

①如果用高锰酸钾制氧气，应选用的发生装置是                （填序号），反应的化学方程式                         ，所选发生装置中还缺少                           。

②若B中装有石灰石和稀盐酸，则该装置可用于制取              气体，收集该气体可选用               装置，检验该气体是否收满的方法是                             。

(3)实验室常用氯化铵固体与碱石灰固体共热来制取氨气（NH₃）。常温下NH₃是一种无色、有刺激性气味的气体，密度比空气小，极易溶于水。在加热条件下能与氧化铜反应生成铜、水和空气中含量最多的气体。

①制取并收集NH₃，应该从上图中选择的发生装置是                 ，收集装置是               。(填字母编号)

②请写出氨气和氧化铜反应的化学方程式                            。

常务理事人数一般不超过理事人数的( )。

A．1/3
B．2/3
C．1/2
D．1/5

醋炙延胡索增强下列何种作用（）

A.疏肝止痛

B.疏肝解郁

C.行气活血

D.行气止痛

The food we eat seems to have profound effects on our health.Although science has made enormous steps in making food more fit to eat ,it has, at the same time,made many foods unfit to eat. Some research has shown that perhaps eighty percent of all human illnesses are related to diet and forty percent of cancer is related to the diet as well,especially cancer of the colon. Different cultures are more likely to cause certain different illnesses because of the food that is characteristic in these cultures. That food is related to illness is nto a new discovery. In 1945, about 35 years ago, government researchers realized that nitrates, commonly used to preserve color in meats,and other food additives,caused cancer. Yet, these carcinogenic additives remain in our food, and it becomes more difficult all the time to know which things on the packaging labels of processed food are helpful or harmful. The additives which we eat are not all so direct. Farmers often give penicillin to beef and living animals, and because of this ,penicillin has been found in the milk of treated cow. Sometimes similar drugs are given to animals not for medical purposes,but for financial reasons. The farmers are simply trying to fatten the animals in order to obtain a higher price on the market. Although the Food and Drug Administration(FDA) has tried repeatedly to control these procedures, the practices continue.

How has science done something harmful to mankind?（）

A.Because of science , diseases caused by polluted food haven been virtually eliminated.

B.It has caused a lack of information concerning the value of food.

C.Because of the application of science,some potentially harmful substances have been added to food.

D.The scientists have preserved the color of meats,but not of vegetables.

转向架组成后，钢轨外侧各垂下品与轨面最小距离为（）

A.25mm

B.48mm

C.60mm

D.80mm