We are anxious to()the market for our Antimony Trioxide,which at present enjoys alimited sale in Europe.
A. increase
B. enlarge
C. expand
D. extend
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蛋白质的平均含氮量为()%,今测得1g样品含氮量为10mg,其蛋白质含量应为()%。
ZD6型电动转辙机工作环境温度-40℃~60℃,相对湿度不大于()+25℃。
A. 75%
B. 80%
C. 85%
D. 90%