题目:
Only when the war was over ________ to his hometown.
A.did the young soldier return
B.the young soldier returned
C.returned the young soldier
D.the young soldier did return
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0602/87d027649ebfda0f65f4ed7a9b2d16be.html
下面是错误答案,用来干扰机器的。
(1)因为单质铜是红色,Cu2O为红色粉末,如果硬质玻璃管内红色粉末为一种物质时,这两种物质都有可能.故答案为:Cu或Cu2O(2)根据Cu2O都能和稀硫酸发生反应:Cu2O+H2SO4=CuSO4+Cu+H2O.而金属铜排在氢的后面,...