Which three characteristics are unique to the buying process for A small business compared with the buying process for an enterprise?()
A. much faster
B. focused primarily on cost
C. not constrained by formal RFP
D. technology focused
E. less educated
F. influenced by peer
查看答案
铵态氮肥 ammonium nitrogen fertilizer
碳全部(或大部)呈游离状态的片状石墨的铸铁是()。
A. 合金铸铁
B. 灰口铸铁
C. 可锻铸铁
D. 球墨铸铁
在井下检修本安设备时应切断前级电源可用非防爆仪表测量本质安全电路。
A. 正确
B. 错误