The equipment, method and advantages of rigid bed-sweeping bygrab dredger are presented combining an engineering case.
结合实例阐述了利用抓斗船进行硬式扫床的设备结构，扫床方法及其优点。
2
Statistical treatment of environmental monitoring data obtained bygrab sampling of carbon disulfide in a certain synthetic fibre factory was carried out.
通过对某化纤厂二硫化碳的定点采样资料的分析，探讨了环境监测的数据处理。
3
Last fall's controversial "land grab" reported by the World Bank noted that, since 1990, Latin American soybean yields grew at twice the speed of America's.