【判断题】不锈钢和耐热钢 :钢号中碳含量以千分之几表示。例如“2Cr13”钢的平均碳含量为0.2%;若钢中含碳量≤0.03%或≤0.08%者,钢号前分别冠以“00”及“0”表示之,例如 00Cr17Ni14Mo2、0Cr18 Ni9等.
【简答题】平行进化 parallel evolution
【简答题】说明下列钢材牌号属何类钢?其数字和符号各表示什么? Q460B Q355NHC 20Cr 9CrSi 50CrVA GCr15SiMn 12Cr13 Cr12 W6Mo5Cr4V2
【简答题】牌号解释: 1、 Q235表示屈服点(σs)为235 MPa的碳素结构钢。 2、45钢 3、 T8 4、 40Cr 5、 12CrMoV 6、 2Cr13"钢的平均碳含量为0.2%
【单选题】Which of the following is NOT true concerning “parallel session”?
A.
Parallel session is smaller-scale meetings which take place at the same time in different rooms.
B.
Young scholars usually present their papers at the parallel session.
C.
Parallel session may involve more detailed discussion between authors and participants.
D.
Parallel session doesn’t allow walk-ins and walk-outs.
【简答题】GPS直接测定的是()坐标系中的大地经度、大地纬度和大地高。