下列句子中划线实词解释全对的一项是( )
A:寻声暗问弹者谁(偷偷地问) 去来江口守空船(回来)
B:银瓶乍破水浆迸(骤然) 今漂沦憔悴(堕落)
C:凝绝不通声暂歇(忽然) 如听仙乐耳暂明(暂时)
D:整顿衣裳起敛容(庄重的) 钿头银篦击节碎(拍子)
取锌、铜的混合物8g与154.7g稀硫酸恰好完全反应,称得剩余物质的总质量为162.5g.请计算:
(1)产生氢气的质量是多少?
(2)反应后所得溶液中溶质的质量分数是多少?
— The summer holiday is on the way. We'll have more freedom.
— . But we should learn to manage ourselves.