问题
选择题
______ the time the doctor arrived the patient had died.[ ]
A. By
B. At
C. In
答案
答案：A
搜题请搜索小程序“爱下问搜题”
______ the time the doctor arrived the patient had died.[ ]
A. By
B. At
C. In
答案：A
的混合粉末,加入过量盐酸,充分反应后过滤,得到沉淀X和滤液Y。下列叙述正确的是[ ]
酸性最强 
