某项目水泥必需消耗量是51500t，损耗率为3%，则水泥净用量为( )t。
A．50000
B．48500
C．42000
D．65000
参考答案：A
极其细小油滴群的燃烧，可以看作是（）
A.预混燃烧
B.扩散燃烧
C.喷雾燃烧
D.混合燃烧
In foreign trade business, the trade terms CFR is often used, CFR is the abbreviation for
A．cost, insurance and freightB．commercial invoiceC．cost and freightD．consular invoice
