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Washington, D.C. Bicycle Tours Cherry Blossom Bike Tour in Washington, D.C. Duration Tour This small group bike tour is a fantastic way to see a world-famous cherry trees with beautiful flowers of Washington, D.C. Your guide will provide a history lesson about the trees and the famous monuments where they blossom. Reserve your spot before availability — the cherry blossoms—disappear! Washington Capital Monuments Bicycle Tour Duration:3 hours (4 miles) Join a guided bike tour and view some of the most popular monuments in Washington, D.C. Explore the monuments and memorials on the National Mall as your guide shares unique facts and history at each stop. Guided tour includes bike, helmet, cookies and bottled water. Capital City Bike Tour In Washington, D.C. Duration:3 hours Morning or Afternoon, this bike tour is the perfect tour for D. C. newcomers and locals looking to experience Washington, D.C. in a healthy way with minimum effort. Knowledgeable guides will entertain you with the most ,interesting stories about Presidents, Congress, memorials, and parks. Comfortable bikes and a smooth tour route(路线)make cycling between the sites fun and relaxing. Washington Capital Sites at Night Bicycle Tour Duration:3 hours(7miles) Join a small group bike tour for an evening of exploration in the heart of Washington, D.C. Get up close to the monuments and memorials as your bike the sites of Capitol Hill and the National Mall. Frequent stops are made for photo taking as your guide offers unique facts and history. Tour includes bike, helmet, and bottled water. All riders are equipped with reflective vests and safety lights. Which tour do you need to book in advance? A.Cherry Blossom like Tour in Washington, D.C. B.Washington capital Monuments Bicycle Tour. C.Capital City Bike Tour in Washington, D.C. D.Washington Capital Sites at Night Bicycle Tour. What will you do on the Capital City Bike Tour?A.Meet famous people. B.Go to a national park. C.Visit well-known museums. D.Enjoy interesting stories. Which of the following does the bicycle tour at night provide?A.City maps. B.Cameras. C.Meals D.Safety lights
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【单选题】形状位置公差简称为
A.
几何公差
B.
尺寸公差
C.
公差
D.
误差
【判断题】形状和位置公差简称形位公差
A.
正确
B.
错误
【简答题】在双缝夫琅和费衍射实验中,所用光长λ=632.8nm,透镜焦距 f =50cm,观察到两相邻亮条纹之间的距离 e =1.5mm,并且第4级亮纹缺级。试求(1)双缝的缝距和缝宽;(2)第1,2,3级亮纹的相对强度。
【判断题】形状公差和位置公差简称为形位偏差。
A.
正确
B.
错误
【单选题】关于助悬剂的错误叙述为
A.
助悬剂是混悬剂的一种稳定剂
B.
助悬剂可以增加介质的黏度
C.
可增加药物微粒的亲水性
D.
助悬剂可降低微粒的ζ电位
【判断题】亚里士多德认为美的三原则是高华、匀称、明确A. √B. ×
A.
正确
B.
错误
【判断题】亚里士多德认为美的三原则是高华、匀称、明确。()
A.
正确
B.
错误
【单选题】关于助悬剂的错误叙述为
A.
助悬剂是混悬剂的一种稳定剂
B.
助悬剂可以增加介质的黏度
C.
可增加药物微粒的亲水性
D.
亲水性高分子溶液常用作助悬剂
E.
助悬剂可降低微粒的ζ电位
【判断题】亚里士多德认为美的三原则是高华、匀称、明确
A.
正确
B.
错误
【单选题】古埃及的数学知识常常记载在( )
A.
纸草书上
B.
竹片上
C.
木板上
D.
泥板上
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