能改变整幅图像密度的处理参数是（）
A.GT
B.GA
C.GC
D.CS
E.RN
参考答案：D
下列产品属于抗生素的是（ ）
A．链霉素
B．青霉素
C．氨基酸
D．食用有机酸
— Where was ____ you first met with your wife?
— It was in Tianjin where we worked 30 years ago. [ ]
A. it that
B. it
C. the place
D. there
