街头上有许多便宜的“黄金”饰品出售，实际上它们不是黄金，而是铜锌合金，因其具有较好的机械性能和光泽度，所以常被做成饰品．现取30g该合金样品，投入到196g某浓度的稀硫酸中，恰好完全反应后，剩余的溶液和残余固体总质量为225.6g．请计算：

阅读理解。
    In a small town, there lived a doctor. He was good and kind. He was ready to go and help people. People always went to him when they were ill.
    Many years later, the doctor began to forget things. The people were afraid and little by little, they stopped going to him. The doctor saw his business (生意) wasn't as good as before. He thought, “Well, if I were the patients(people who don't feel well), I'd be afraid to go to me too. Maybe it's time for me to stop being a doctor. But if this town has no doctor, what will the people do when they become ill?”
    His wife heard him talking to himself and said, “Why don't you find a young doctor to take your place? Then people will have another good doctor to take care of them and I will get my husband back.”
    The doctor did as what his wife said. He found a very good young doctor to help the people. The doctor and his wife then had time to take long walks together, go dancing, go traveling and spend the rest of their days together.

据报道，2011年2月25日，阳明滩大桥完成主桥难度最大、最长的一段钢梁拼装顶推参加阳明滩大桥建设的国字号施工企业近1700名施工人员已全部到岗就位，标志着阳明滩大桥全线复工建设。下列有关认识不正确的是(    )

在“探究力和运动的关系”的实验中，让木块由静止开始沿斜面滑下，木块在三种不同水平面上运动一段距离后分别停留在如图所示的位置．

— Is he your friend?

—            , he is.