下列比例尺中,表示内容最详细的是[ ]
A.1:1600000
B.二百万分之一
C.
D.1/5000000
答案:C
下列元素的最高价氧化物对应水化物的酸性最强的是( )
A.Si
B. P
C. S
D.Cl
He was a good student and scored _____ average in most subjects. [ ]
A. below
B. of
C. on
D. above