缺铁性贫血的最常见原因是
A.慢性失血B.铁的需要量增加C.铁摄入量不足D.铁的吸收不良E.长期接触x线
参考答案:A
下列表示对应化学反应的离子方程式正确的是( )
A.用氯化铁溶液腐蚀铜板:Cu+Fe3+=Cu2++Fe2+
B.Fe3O4与足量稀HNO3反应:3Fe3O4+28H++NO3-=9Fe3++NO↑+14H2O
C.用小苏打治疗胃酸过多:NaHCO3+H+=Na++CO2↑+H2O
D.往KAl(SO4)2溶液中滴入Ba(OH)2溶液至沉淀的物质的量最大:Al3+ + 2SO42- + 2Ba2+ + 4OH-="=" AlO2-+ 2BaSO4↓+ 2H2O
—Where did you go last week?
—I went to Zhang Aiping's hometown and visited the house ______ he was born in. [ ]
A. that
B. there
C. who
D. whose