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[主观题]

Modern mass-production methods lower the cost of making goods, and thus give us better val

ues. At the same time, American ingenuity (独创性) and science are constantly at work improving the quality of products. In this way, better quality products at good values are continually being brought to the people of all income groups.

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

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第1题

不属于X全射照射治疗中剂量监测范围 ()

A、总剂量

B、屏蔽挡铅的透射剂量

C、主要器官剂量

D、照射部位剂量均匀性

E、输出剂量率

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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

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

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第3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

点击查看答案

第4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

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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

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

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第6题

()的目的是对主要的受照器官或组织所接受的平均剂量或全身剂量(有效剂量)作出估算,进而控制工作人员所受的剂量,并证实他们接受的剂量是符合有关国家标准。

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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