患者,女,30岁。经常饭前胃脘疼痛,近日发现大便发黑,检查大便潜血试验(+),诊为胃出血。应首选的药物是()
A.小蓟
B.地榆
C.白及
D.白茅根
E.蒲黄
参考答案:C
Only when _____ home_____ that he had left his bag in the taxi he had taken.[ ]
A. he returned; did he realize
B. did he return; did he realize
C. he returned; he realized
D. did he return; he realized
实验室常用过氧化氢溶液与二氧化锰混合制取氧气.现将2.5g二氧化锰放入盛有100g过氧化氢溶液的锥形瓶中,反应完全结束后,共收集到1.6g气体.请完成下列问题:
(1)反应结束后,过滤,洗涤并烘干滤渣,称得滤渣的质量为______g.
(2)计算原过氧化氢溶液中溶质的质量分数.