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拉深时,拉深件的侧壁厚度是不均匀的,上部增厚,愈接近口部增厚愈多;下部变薄,愈接近底部圆角变薄愈大。( )A.
正确
B.
错误
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【简答题】( )装置是一种控制系统,是数控机床的中心环节。它能自动阅读输入载体上事先给定的数字,并将其译码,从而使机床进给并加工零件,数控系统通常由输入装置、控制器、运算器和输出装置4大部分组成 。
【简答题】"Are you crazy?" people around him shouted as Alex mien, a 33-year-old immigrant(移民), rantoward three cars in a chain accident along the highway in Miami, which were burning down. Alexdidn&39;t think ...
【简答题】Section BPassage One Questions 27 to 29 are based on the passage you have just heard. 第27题： A)One-week language course in England. B)Two-week trip to London. C)One-week trip to Germany. D)Free visit t...
【简答题】_______________________________ (必须立即采取有效措施) to keep our country, from going under.
【简答题】场效应晶体管是利用半导体表面的（ ）效应进行工作的。（两个字）
【单选题】Which sentence best describes the author’s opinion about steam cars?
A.
Despite all its advantages, nobody wants to have a steam car now.
B.
Cyclone Technologies has developed a new efficient steam engine, so soon steam cars will reappear in the market.
C.
Steam cars have been an important part of transport history, and some companies are still manufacturing them now.
D.
Steam cars were once popular but now only remain in the hands of enthusiasts.
【简答题】But are steam cars________ to the past, a now obsolete stepping stone in automotive history? Perhaps not.
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