板中采用绑扎钢筋作配筋时,其受力钢筋的间距:板厚A≤150mm时,不应大于()。²
A. 300mm
B. 200mm
C. 100mm
D. 50mm
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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
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()%。