根据钢中有害杂质硫、磷的多少，工业用钢可分为( )。
A．高级优质钢
B．结构钢
C．特殊性能钢
D．普通钢
E．优质钢
参考答案：A,D,E
.
Britain’s press is unusual in____it is divided into two very different types of newspaper : the equality press and the popular press.
A．how
B．what
C．which
D．that
自动生化分析仪交叉污染与哪个部件无关（）
A.加样针
B.试剂针
C.搅拌棒
D.光度计
E.比色杯
