【单选题】20CrMnTi是最常用的合金渗碳钢,其最终热处理为 ( )
【简答题】当时的条件不允许帮助你。 Conditions didn't________ ________you.
【单选题】One of the solutions suggested to improve the conditions of underdevelopment is ______.
A.
to build more factories
B.
to obtain technical advisors from the Western world
C.
to upgrade the educational and science programs
D.
to increase production and raise profits
【判断题】合金渗碳钢常用的最终热处理是渗碳、淬火及高温回火。
【单选题】If you don’t_________at least one of the conditions,you can’t become a member of our club.
【单选题】Something is wrong with his camera. It can’t be _______ to take photos in cloudy conditions.
【判断题】渗碳钢最终热处理是淬火+高温回火。( )
【单选题】He couldn’t _____ the terrible working conditions in the factory and decided to leave at once. [ ]
【单选题】20CrMnTi是常见的合金渗碳钢,其最终热处理为( )。
【单选题】汽车变速齿轮用20CrMnTi钢制造,其最终热处理是( )。