首页
登录
职称英语
A certain spiral staircase is designed so that each step after the first one is
A certain spiral staircase is designed so that each step after the first one is
游客
2024-01-12
46
管理
问题
A certain spiral staircase is designed so that each step after the first one is turned 20° counterclockwise from the one immediately below it, how many of the steps make up 2.5 complete revolutions?
选项
A、18
B、36
C、38
D、45
E、50
答案
D
解析
某一螺旋梯按照高一级台阶相对于低一级台阶逆时针旋转20°来设计，问2.5圈的旋梯共有多少级台阶组成?
解：本题的正确答案为(D)。“revolution”意为旋转一周，由题意可得台阶数为：360°× 2.5 ÷ 20°=45
转载请注明原文地址:https://tihaiku.com/zcyy/3356248.html
相关试题推荐
Toronto’sthirdCityHall,nowknownasOldCityHall,wasdesignedbyEdwar
Toronto’sthirdCityHall,nowknownasOldCityHall,wasdesignedbyEdwar
Toronto’sthirdCityHall,nowknownasOldCityHall,wasdesignedbyEdwar
Ourpreferencesforcertaincolorsare______accordingtothepassage.[br]Whi
Ourpreferencesforcertaincolorsare______accordingtothepassage.[br]Whi
Ourpreferencesforcertaincolorsare______accordingtothepassage.[br]If
Thedegree______youmaintainyourmentalhealthmaydependoncertainsimpleenv
SpeakerA:I’dlikeabeer.SpeakerB:Certainlysir,______A、I’lltakeit.B、w
Toronto’sthirdCityHall,nowknownasOldCityHall,wasdesignedbyEdwar
Toronto’sthirdCityHall,nowknownasOldCityHall,wasdesignedbyEdwar
随机试题
HowdoestheBritishQueenfeelabouttheInternet?[originaltext]Itmightseem
Successfulcompaniesconcentrate(much)________onsellingtheirproductstothe
[originaltext]M:Honey,thebasketballgameisabouttostart.Andcouldyoubr
ItiswidelyacceptedthatEnglishisth
下列关于Linux文件组织方式的说法中，（）是错误的。A.Linux文件系统使
可使粘膜着色的含漱液是()A.1%NaHCO B.盐水 C.朵贝
课外和校外教育活动的内容要受教学大纲和教材的约束。（ ）
乳腺癌患者术后监测常选用的肿瘤标志物组合是（）。A.CA125，CEA B.
卡莫司汀为A.亚硝基脲类抗肿瘤药B.乙烯亚胺类抗肿瘤药C.噻唑烷二酮类降糖药D.
根据《执业药师职业资格制度规定》，取得药学类相关专业大专学历，报考执业药师职业资
最新回复
(
0
)
