单项选择题
Q345钢材牌号中的345表示钢材的哪一种强度?A.极限强度B.比例极限强度C.屈服强度D.断裂强度
单项选择题Q345钢材牌号中的345表示钢材的哪一种强度?
If I find someone who looks like the suspect, my reacti...
单项选择题If I find someone who looks like the suspect, my reaction will be to tell the police.
In April, thousands of holidaymakers remained_______abr...
单项选择题In April, thousands of holidaymakers remained_______abroad due to the volcanic ash cloud.