下面（）不影响合金的吸收率。
A.钢水氧化性
B.天气温度
C.终渣氧化铁含量
D.铁合金状态
参考答案：B
My neighbour devoted his spare time ________ ancient coins. [ ]
A. to collect
B. to collecting
C. on collecting
D. in collecting
指示标志主要是指示商品性质、堆放、开户和吊运方法等内容
