以短期利润为目标的营销策略通常称( )战略。
A.收割 B.放弃 C.拓展 D.维持
参考答案:D
28.When the telephone rang, I happened________in the kitchen, but when I came over to get it, it
rang off.
A.to cook
B.to have cooked
C.to be cooking
D.having cooked
下列是某纽扣电池的反应原理:X+Zn+HgO=Zn(OH)2+Hg
(1)该反应中X的化学式为______;Zn的化合价变化为0→______;
(2)写出用氧化汞冶炼汞的化学方程式___________________________-.