首页
登录
职称英语
[originaltext] Watches, which are really small clocks, were first made durin
[originaltext] Watches, which are really small clocks, were first made durin
游客
2024-02-25
34
管理
问题
Watches, which are really small clocks, were first made during the sixteenth century. The earliest watches were made of heavy iron, and people wore them hanging from their belts. Little by little, watches were made smaller so that they could be carried more easily. The invention of the machinery for the mass production of these parts of clocks and watches was an important step in making clocks and watches available to the general public. In some watches, small pieces of precious stones, such as rubies or sapphires, are used at the points on which the wheels turn. Since these stones are very hard, they do not wear down very easily under the friction of the moving wheels. Thus a watch utilizing such stones will keep accurate time over a much longer period than other watches.
Some modem watches can measure very small fractions of time. These watches are useful in timing athletic events. When a button is pressed on these watches, a special second hand begins to move. This type of watch can also be used to count a patient’s pulse. It would be difficult to imagine today’s world without clocks and watches.
选项
A、Because they have a smooth surface.
B、Because they are very hard.
C、Because they are very expensive.
D、Because they turn very. well.
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3481072.html
相关试题推荐
[originaltext]W:Hi,John.Whatasunnydaytoday,isn’tit?Congratulations!M
[originaltext]In1863,PresidentLincolnmadealaw.Thislawsaidthatonl
[originaltext]M:WhatwasProfessorCalhournsayingaboutthelectureserieson
[originaltext]M:WhatwasProfessorCalhournsayingaboutthelectureserieson
[originaltext]M:WhatwasProfessorCalhournsayingaboutthelectureserieson
[originaltext]Therearetwofactorswhichdetermineanindividual’sintelli
[originaltext]Itisdifficulttogiveanaccuratedefinitionof"temperatur
[originaltext]Someyearsago,anAmericanpolicemanfoundawomanlyingnea
[originaltext]Someyearsago,anAmericanpolicemanfoundawomanlyingnea
[originaltext]M:WhatwouldyouwishforifIletyoumakeawish?W:I’dwish
随机试题
Whatisnottheelementindefininglanguage?A、systemicB、arbitraryC、symbolD、v
【S1】[br]【S5】develop→bedeveloped这里应该用被动式。
以下哪种情况有助于提高内部审计部门和外部审计部门之间的总体审计效率?A、缩小内部
下列几种方法中,哪一种不能测定砌体或砂浆的强度?A.回弹法测砂浆的抗压强度 B
49岁,男性,劳累出现后发作性胸痛,疑为心绞痛,其心电图依据是A.窦性心动过速
网络环境下房源信息的特征有()。A:不易保存 B:资讯及时 C:资讯量大
进行尸检应当在患者死后A:24小时 B:48小时 C:10小时 D:2周
未成年人因不满( )周岁不予刑事处罚的,责令其父母或者其他监护人严加管教;在必
企业的技术改造可以分为表层、内层和深层三个层次,表层的技术改造主要包括()。A
诉讼公正是维护社会正义的最后一道屏障,其包括实体公正和程序公正两个方面,下列哪一
最新回复
(
0
)