下列物质中一定含有氢氧根离子的是( )
A.碱
B.酸
C.盐
D.单质
答案:A
_____ recent report stated that the number of Spanish speakers in the US would be higher than
the number of English speaker by_____ year 2090.[ ]
A. A; the
B. A; /
C. The ;/
D. The, a
用本年度实际完成销售额与()进行对比,即可得出销售增长情况。