After John wrote the abstract "针对不同锰、钒含量的Q345塔材用钢进行了微观组织和冲击性能分析.结果表明:锰含量较高(1.49％(质量分数))时,钢中形成的珠光体团和铁素体晶粒尺寸较大;添加钒可以明显细化珠光体团和铁素体晶粒.在相当的情况下,增加较多的锰能提高钢的冲击性能,而增加少量的钒却能显著提升钢的冲击性能.钢样的断口都呈现韧窝状断口,而钒含量较高时,断口上韧窝尺寸相对细小和均匀.", he wrote these keywords "锰, 微观组织, 冲击性能, 塔材用". Do you think his choice of keywords was correct? Answer yes or no.
no