【简答题】Please listen to the TED speech carefully and try to write down every sentence in detail. Check the answer and remember the now words and phrases.
【简答题】选择题: 1 . Fe ― Fe 3 C 合金中,合金具有最好流动性的是( )。 ( A ) C%=4.00% ( B ) C%=4.30% ( C ) C%=4.80% ( D ) C%=5.00% 2 .凝固的热力学条件为( )。 ( A )形核率 (B) 系统自由能增加 ( C )能量守衡 ( D )过冷度 3 .二元相图中,当有二次相析出时,固溶线表现为 ( )。 A 垂线 B 水平线 C...
【简答题】The design of a machine includes many factors other than those of determining the loads and stresses and selecting the proper materials. Before construction or manufacture can begin, it is necessary t...