了解户外广告时必须注意其()
A.关注度
B.接触流量
C.收听率
D.毛评点
参考答案:A, B
下列离子方程式中,正确的是 [ ]
A.铝与盐酸的反应:2Al+6H+==2Al3++3H2↑
B.碳酸氢钠与盐酸反应:CO32- +2H+==CO2↑+H2O
C.铜与稀硝酸反应:Cu+H++NO3-==Cu2++NO↑+H2O
D.硫酸与氢氧化钡反应:H++OH-==H2O
Ms Lin is chidren .She can look after them and play with them well
A.good with
B.different from
C.famous for
D.similar to