一企业有两个生产同类产品的车间，A车间的凝聚力明显弱于B车间，但A车间的生产效率又明显高于B车间。请分析以上现象的成因以及上级主管部门提高B车间生产效率的对策。
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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
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
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