劲性骨架浇筑混凝土拱圈，主要用于大跨径拱桥，无支架悬挂模板现浇。
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What exactly did he do at the company?
A. Visited customers
B. Dispatched consignments
C. Translated articles
D. Visited customers, dispatched consignments and things like that
钢筋混凝土构件（拱肋）在施工过程中，自身能够承担自身重量，不需要借助其他构件承担。
A. 对
B. 错
Why did Wang Lei leave the company?
A. Because he grew up in a city in the Northeast.
Because he has lots of acquaintances in the region.
C. Because there were not many opportunities for self-development.
D. Because he had established business ties with several firms.
单孔无圬工基础管涵施工时，在严寒地区管节的下侧可以填筑冻胀土料。
A. 对
B. 错
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