污染切口是指()
A．腹股沟疝修补术
B．胃大部切除术
C．胆囊切除术
D．阑尾穿孔切除术
E．小肠部分切除术
参考答案：D
It is safe to say that Chinese advertising as a whole tends to be more ______ than English advertising.
轧辊转速，连轧常数，轧件断面积，轧辊工作直径分别为n.C.F.Dk下面公式正确的确是（）
A、n=FDF/C
B、nF=C/DF
C、F=（n/DR）*C
D、C=n/FDF
