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C Marco Polo was born in Italy in 1254. When he was 17 years old, he traveled across Europe and Asia with his father , who wanted to do trade with the Chinese . Eventually , they arrived in Beijing .At that time, China was ruled by the Yuan Dynasty Emperor, Kublai Khan. Kublai Khan welcomed Marco and his father. He was very happy to meet two foreigners and wanted to learn all about Europe. Marco and his father were guests at the Emperor’s Palace. Although Marco was young, he was very clever and could already speak four languages. The Emperor was impressed by him and they became friends.He asked Marco to serve in his court and sent him to do many important tasks across the country. In 1291, after 17 years of service to the Emperor, Marco returned to Italy. He was now a very wealthy man. Not long after his return , a local war broke out near his town. During the war, Marco was the captain of a warship but was caught by the enemy and put into prison. However, Marco was lucky enough to meet another prisoner who enjoyed listening to his stories about China. The prisoner was an author and he took dictation while Marco told all his stories to him. The prisoner then wrote the stories in a book called The Description of the w orld, which became one of the best-selling books in Europe. Although people enjoyed reading his book, many of them thought that Marco’s stories about China were too fantastic to be true. But Marco always stood by his tales. Just before w hen Marco was asked the question, “Was it all true?”, to which he replied, “I have only told a half of what I saw!”
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【简答题】一个系统的动量守恒和角动量守恒的条件有何不同?
【单选题】随附单证栏应填写___
A.
B:XXXX
B.
A:XXXX
C.
B
D.
不填
【单选题】下列关于拱圈混凝土浇筑说法,不正确的是______。
A.
衬砌浇筑时中途中断,超过规定时间可按施工缝处理
B.
拱顶混凝土浇筑时应预留注浆孔
C.
拱顶注浆在混凝土强度达到100%后进行
D.
混凝土衬砌由拱顶向两侧浇筑
【多选题】下列选项中,关于防水混凝土浇筑的说法,正确的是( )。
A.
浇筑前,应将模板内部清理干净,木模用水湿润模板
B.
浇筑时,若入模自由高度超过5m,则必须用串筒、溜槽或溜管等辅助工具将混凝土送入,以防离析和造成石子滚落堆积,影响质量
C.
在防水混凝土结构中有密集管群穿过处、预埋件或钢筋稠密处,浇筑混凝土有困难时,应采用相同抗渗等级的细石混凝土浇筑
D.
预埋大管径的套管或面积较大的金属板时,应在其底部开设浇筑振捣孔,以利排气、浇筑和振捣
E.
随着混凝土龄期的延长,水泥继续水化,内部可冻结水大量减少,同时水中溶解盐的浓度增加,因而冰点也会随龄期的增加而降低,使抗渗性能逐渐提高
【单选题】“随附单据”栏应填写( )。
A.
发票、装箱单
B.
商检证
C.
0:1100—2004—10494
D.
《机电产品自动进口许可证》
【单选题】“随附单据”栏应填写( )。
A.
A:4430510G6842158
B.
A·O
C.
自动进口许可证
D.
此栏不填
【单选题】“随附单据”栏应填写( )。
A.
A:4430510G6842158
B.
A·O
C.
自动进口许可证
D.
此栏不填 入境货物通关单
【多选题】关于混凝土浇筑的说法中,正确的是()。
A.
混凝土的浇筑,应由低处往高处分层浇筑
B.
浇筑中不得发生离析现象,当浇筑高度超过3m时,应采用串筒、溜管或振动溜管
C.
在混凝土浇筑过程中,应经常观察模板、支架、钢筋、预埋件和预留孔洞的情况
D.
混凝土浇筑后,必须保证混凝土均匀密实,充满模板整个空间
E.
浇筑应连续进行,允许间歇时间由混凝土凝结时间而定,若超过时,应留设沉降缝
【单选题】“随附单据”栏应填写( )。
A.
装运单
B.
O:2018—5642—9520
C.
商检证
D.
《机电产品自动进口许可证》
【简答题】一个系统的动量守恒和角动量守恒的条件有何不同?
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