In 1975, Shenyang introduced a third variant for both high - and low - to medium-altitude reconnaissance missions.
在1975年,沈阳公司推出了第三种改型用于高空和低空到中空两者侦察任务。
2
The variant cell lines still have high ability of accumulating free proline after cultivation on normal medium, which indicated the variant cell lines have steady salt tolerance.