题干

关于物体的重心,下列说法中正确的是(   )

A:任何物体的重心都一定在这个物体上

B:重心的位置只与物体的形状有关

C:形状规则、质量分布均匀的物体,其重心在物体的几何中心

D:物体重心的位置一定会随物体形状改变而改变

上一题 下一题 0.0难度 选择题 更新时间:2019-03-02 05:02:52

答案(点此获取答案解析)

C

同类题2

阅读下面文言文,完成下列各题。

                                                                                                   【甲】

      马之千里者,一食或尽粟一石。食马者不知其能千里而食也。是马也,虽有千里之能,食不饱,力不足,才美不外见,且欲与常马等不可得,安求其能千里也?

      策之不以其道,食之不能尽其材,鸣之而不能通其意,执策而临之,曰:“天下无马!”呜呼!其真无马邪?其真不知马也。

                                                                                                                                                                       (选自韩愈《马说》)

                                                                                                  【乙】

      韩愈字退之,昌黎人。愈生三岁而孤,养于从父兄。愈自以孤子,幼刻苦学儒。

      寻登进士第。宰相董晋出镇大梁,辟为巡官。愈发言真率,无所畏避,操行坚正,拙于世务。德宗晚年,政出多门,宰相不专机务,宫市之弊,谏官论之不听,愈尝上章数千言极论之,不听,怒贬为连州阳山令。

                                                                                                                                                                  (选自《旧唐文•韩愈传》)

     【注】①从:堂房亲属。②辟(bi):征召。③宫市:原意指宫廷内所设的市肆。唐德宗贞元末年,宫中派宦官到民间市场强行买物,口称“宫市”,实为掠夺。

同类题3

根据短文内容,从短文后的选项中选出适当的选项补全短文,并将选项的编号字母依次填入题号后横线上。
    A recent survey has shown that China is considered to be (he most indusuious nation in the world,____ .
    The survey 一with more than 8,000 people surveyed from Canada. France, Germany, India, Netherlands, the UK and the US—ranks their 'industriousness(勤奋度),which describes (he level to which a country is “hard—working, creative in producing new ideas or products”.
According to the international survey,____ , followed by workers from Germany and the US. Employees from a France are considered 10 be the laziest people in the world. German employees replied confidently to the survey, placing themselves first in the order of global industriousness French employees, on the other hand, seem to know (heir limitations (能力局限)____ .
A Germany newspaper reported that Chinese employees work on average 44.6 hours per work, ____ .
____ , Chinese employees have only ten days of paid leave on average, while German employees have twenty—five days. Industriousness Ranking: China, Germany, the US, Canada, India, the UK, Netherland, France.


A.emplyees from China get second place in the list
B.Although China has more public holidays than Germany
C.and many of those surveyed placed France in the last place
D.Chinese employees are the most industrious people in the world

E.while German employees average about 33.5hours of work per week
F.according to the research from Monster Worldwide and GFK,a German global market research institute.