A、B两个容器装有质量相同的酒精溶液,若从A、B中各取一半溶液,混合后浓度为;若从A中取、B中取溶液,混合后浓度为。若从A中取、B中取溶液,则混合后溶液的...

作者: tihaiku 人气: - 评论: 0
问题 A、B两个容器装有质量相同的酒精溶液,若从A、B中各取一半溶液,混合后浓度为;若从A中取、B中取溶液,混合后浓度为。若从A中取、B中取溶液,则混合后溶液的浓度是( )
选项 A.48% B.50% C.54% D.60%
答案 C
解析 设A、B酒精溶液的质量均为100g,A的纯酒精为a克,B的纯酒精为b克,则根据已知条件可得:a/2+b/2/50+50×100%=45%……① a/2+b/4/50+25×100%=40%……② ,由①、②可得:a=30,b=60,则30/5+60×4/5/20+80×100%=6+48/100×100%=54%。因此,C项当选。

相关内容:两个,容器,质量,酒精,溶液,若从,中各,混合,浓度,中取

更多 网友评论0 条评论)
暂无评论
错误啦!

错误信息

  • 消息: [程序异常] : MISCONF Redis is configured to save RDB snapshots, but it's currently unable to persist to disk. Commands that may modify the data set are disabled, because this instance is configured to report errors during writes if RDB snapshotting fails (stop-writes-on-bgsave-error option). Please check the Redis logs for details about the RDB error.
  • 文件: /twcms/kongphp/cache/cache_redis.class.php
  • 位置: 第 85 行
    <?php echo 'KongPHP, Road to Jane.'; ?>