题目

In order to promote its brand, the company has put a lot of money and energy to launch an advertising _________.    A. struggle   B. movement   C. promotion     D. campaign 答案：D用铂作电极电解1L含有0.4molCuSO4和0.2molNaCl的水溶液，一段时间后在一个电极上得到了19.2 g Cu，在另一极上析出的气体在标况下的体积是 A．4.48 L            B．5.6 L             C．6.72 L            D．13.44 L