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回答{TSE}题: How Technology Pushes Down Price 1 Prices have fallen in the foodbusiness heeause of advances in food production and distribution technology.Consumershave benefited greatly from those advances.People who predicted that the wold would run out of food were wron9.We are producing more and more food with less and less capital.Foodis therefore more plentiful and cheaper than it has ever been.Spending on food compared with other goods has fallen for many years,and continues to drop. 2 Supermarkets have helped pushdown prices mainly because of their scale.Like any big business’they can invest in IT systems that make themefficient.And their size allows them to buv in bulk.As supermarkets get bigger,the prices getlower. 3 Huge retail companies such asWal-Mart have tremendous power and they can put pressure on producers to cuttheir margins.As a result,some producers have had to make cuts.Inrecent years. Unilever has cut its workforce by33,000 to 245,000 anddropped lots of its minor brands as Dart of its“path to growth”strategy.Cadbury has shut nearly 20 percent of its 133 factories and cut 10Dercent of its 55,000 global workforce.These cuts help keep costs down,and theprice of food stays low. 4 Does cheap food make people unhealthy? Cheap food may encotlrage people toeat more.Good companies certainly think that givingpeople more food for their money makes them buy more.Givingpeople bigger portmns IS an easy way of making them feel they have got a betterdeal.That is why Dortions have got larger and larger.In America,soft drinks came in 80z(225g)cansin the past,then 120z(350g),andnow come in 200z(550g)calls.If a company can sell youan 80z portion for$7,they can sell you a 120z portionfor$8.The only extra cost to the company is the food,which Drobably costs 25 cents. 5 Now companies are under pressureto stop selling bigger portions for less money.But it is hard to change the trend. {TS}Paragraph 1__________
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举一反三
【判断题】已知某二元理想物系的A、B两组分纯物质的蒸汽压数据如附表所示,现将25℃含A的质量百分数为30%的混合液,以每小时20000kg的流量加入常压操作的精馏塔中,要求塔底产品的流量为15000kg/h。塔顶全凝器冷凝物每10kg就有7kg回流入塔,实际回流比为最小回流比的1.8倍。(1)用M.T.法求理论板数及理论进料位置。若全塔总板效率为45%,求该精馏塔的实际板数及实际进料板位置;(2)设各实际板...
A.
正确
B.
错误
【单选题】下列化学实验中的操作错误的是( )
A.
蒸馏和回流实验中用循环水进行冷却,连接管路的橡胶管必须接牢,而且应时常检查是否老化或容易脱落
B.
使用明火加热低沸点易燃溶剂。
C.
进行蒸馏和回流操作时,务必防止形成封闭体系。
D.
不同的溶剂体系采用不同的加热方式,例如沸点在80℃以下的乙醚、二硫化碳、丙酮等溶剂宜用水浴加热,而且只能从冷水开始加热。
【单选题】午时茶适用于
A.
暑湿感冒,脘腹胀痛,呕吐泄泻
B.
风热感冒,头痛,咽喉疼痛
C.
感冒风寒,内伤积食
D.
头痛咳嗽,咽痒,鼻塞流涕
E.
中暑,头晕
【简答题】旋律音程依照其进行方向分为:( )、下行和( )三种。
【判断题】已知某二元理想物系的A、B两组分纯物质的蒸汽压数据如附表所示,现将25℃含A的质量百分数为30%的混合液,以每小时20000kg的流量加入常压操作的精馏塔中,要求塔底产品的流量为15000kg/h。塔顶全凝器冷凝物每10kg就有7kg回流入塔,实际回流比为最小回流比的1.8倍。(1)用M.T.法求理论板数及理论进料位置。若全塔总板效率为45%,求该精馏塔的实际板数及实际进料板位置;(2)设各实际板...
A.
正确
B.
错误
【单选题】下列操作错误的是( )。
A.
摊晾也称阴干法,即将中药置于室内或阴凉处,使其借温热空气的流动,吹去水分而干燥,适用于芳香性叶类、花类、果皮类等药材
B.
木炭干燥法是把木炭湿润,然后用皮纸包好,夹置于易潮易霉的中药内,可以吸收侵入的水分而防霉虫
C.
翻垛就是将垛底中药翻到垛面,或堆成通风垛,使热气及水分散发。一般在梅雨季节或发现药材含水量较高时采用之;并可利用电风扇、鼓风机等机械装置加速通风
D.
密封的形式可根据中药的性质和数量,采用密封库、密封垛、密封货架和密封包装等方式。
E.
凡中药容易变色、价值贵重、质娇嫩、容易走油、溢糖而生霉虫蛀、回潮后不宜曝晒或烘干的品种可采用石灰箱、石灰缸或石灰吸潮袋的干燥法
【多选题】手抄报版式有( )。
A.
上下对称式
B.
分割式
C.
左右对称
D.
骨架式
【单选题】午时茶适用于
A.
暑湿感冒,脘腹胀痛,呕吐泄泻
B.
风热感冒,头痛,咽喉疼痛
C.
感冒风寒,内伤积食
D.
头痛咳嗽,咽痒鼻塞
E.
中暑,头晕
【多选题】手抄报的基本构成有( )。
A.
刊头
B.
标题
C.
花边
D.
插图
E.
版式
【单选题】操舵装置关机时,操舵方式的选择开关处于 位置
A.
自动
B.
应急
C.
随动
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