As an example of how this worked, when facial tissues (面巾纸) were first put on the market in 1924, they were made in limited quantities and sold at 65 cents per box of 200. People like these facial tissues immediately and began asking for them when they went into different stores. Because there was such a demand for the product, manufacturers began making tissues in larger and larger quantities. Because the manufacturers were making tis-sues in greater quantities, their production costs were lowered, so that the price of tissues went down. In the meanwhile, the quality of facial tissues was constantly improving, because more manufacturers went into the business of making tissues, and each manufac-turer strove to make his product better than his competitors'. Today, instead of costing 65 cents, a box of 200 tissues costs around one-third of that price, and they are both softer and stronger.
When people are free to compete-when they are free to make more things and make them better-everyone benefits.
In regard to the production of goods in greater quantities, the author states that______.
A.the price of the goods should drop
B.the quality of the goods should improve
C.the price and the quality should both rise
D.the quality and the price should both drop
第2题
下列关于X(γ)线全身照射剂量要求描述错误的是
A、剂量率监测必须在治疗平面
B、为了提高入射剂量,患者治疗要加盖一些毯子
C、提高照射野均匀性,可附加均整滤板
D、为了减少对照射剂量影响,可在人体与墙壁之间加一层吸收屏
E、入射剂量是确定中线剂量的关键
第3题
A.剂量率监测必须在治疗平面
B.为了提高入射剂量,患者治疗要加盖一些毯子
C.提高照射野均匀性,可附加均整滤板
D.为了减少对照射剂量影响,可在人体与墙壁之间加一层吸收屏
E.入射剂量是确定中线剂量的关键
第4题
A.剂量率监测必须在治疗平面
B.为了提高入射剂量,患者治疗要加盖一些毯子
C.提高照射野均匀性,可附加均整滤板
D.为了减少对照射剂量影响,可在人体与墙壁之间加一层吸收屏
E.入射剂量是确定中线剂量的关键
第5题
不属于X线辐射损伤的因素是
A.辐射线性质
B.X线剂量
C.照射方式
D.屏-片系统
E.照射部位和范围
第6题
A.环境外照射监测
B.个人外照射监测
C.包装物外照射监测
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