医院健康教育这一概念是由谁最早提出的()
A.英国医疗保险机构
B.美国医疗保险机构
C.英国医疗机构
D.美国医疗机构
E.法国医疗机构
参考答案:B
— What happened to the young trees we planted?
— The trees well, but I didn't water them.[ ]
A. might grow
B. needn't have grown
C. would grow
D. would have grown
已知置换反应:A+B→C+D.
(1)若D为氢气,B为稀硫酸,则A的选择应满足的条件是______;
(2)若D为铜,化合物B可能为______.