黄铜是由铜、锌组成的合金．为测定某种黄铜中锌的含量，取43.4g这种黄铜和质量分数为19.6%的硫酸溶液100g恰好完全反应，将未反应的铜过滤后得到112.6g溶液．
试计算（计算结果保留1位小数）
（1）合金中锌的质量分数；
（2）反应后所得溶液中溶质的质量分数．

如图所示，用两根轻细金属丝将质量为m、长为l的金属棒ab悬挂在c、d两处，置于匀强磁场内．当棒中通以从a到b的电流I后，两悬线偏离竖直方向θ角而处于平衡状态．为了使棒平衡在该位置上，所需的磁场的最小磁感应强度的大小、方向为下列说法不正确的是（   ）

    Many people like to watch TV, There are all kinds of programs on TV. The soap opera is one of them.

    The soap opera was first on the radio in the 1920s, then it started on TV in the 1940s. Why do so many people like to watch soap operas on TV, especially young people? What makes soap operas popular? Let's find out.

    First, what's happening in the soap opera is very different from our lives. Everything is perfect in the play, People don't need to worry about almost anything. People don't have more Problems.

    Second, there are many beautiful girls and handsome boys in the soap opera. They are cool. They make young people crazy. They make young people happy.

    Third, the story in the soap opera is usually interesting. It makes people relaxed after a day's hard work. Even some old people like to watch it, too.

    But some people don't like it, they think the show is too slow and too long. Do you like to watch soap operas? What do you think of them?