大跨径现浇砼拱桥，应沿拱跨方向分段浇筑，分段位置应以能使拱架受力对称，均匀和变形小为原则。
1、正确正确
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Icanspeak_____German.
Thedoctorsare________abouttheguidelinesunderwhichtheycancarryouteuthanasia.
Robotsdifferfromautomaticmachines________aftercompletionofonespecifictask，theycanbereprogrammedbyacomputertodoanotherone.
Heblamedhispoorperformance_____jetlag.
In1900,theUnitedStatesrankedfirstintheworldintheproductionof________.
