The raising of livestock is a major economic activity in semiarid lands, where grasses are generally the dominanttype of natural vegetation.
在半干旱地区，草地通常是最主要的天然植被，而该地区主要的经济活动是家畜饲养。
2
Pathological study was carried out on myelocytomatosis of diseased chickens of naturally infected and dominanttype, concealed type of ELISA positive and negative control group respectively.
对禽骨髓细胞瘤病显性型病鸡、ELISA阳性的隐性型病鸡和阴性对照鸡进行了病理学研究。
3
The dominant reaction pathways and the effect of reaction temperature and type of zeolites on the yield and selectivity of benzene formed during catalytic cracking of cumene were investigated.