问题
选择题
—I lost my bag on my way _______.
—Sorry to hear that. [ ]
A. home
B. to home
C. at home
D. for home
答案
答案:A
—I lost my bag on my way _______.
—Sorry to hear that. [ ]
A. home
B. to home
C. at home
D. for home
答案:A
请按要求填空:
(1)选择你熟悉的物质,用化学式填写在对应的空格中
类别 | 单质 | 氧化物 | 酸 | 碱 | 盐 | 有机物 |
化学式 | ______ | ______ | ______ | ______ | ______ | ______ |
(3)写出用过氧化氢与二氧化锰混合氧气的化学反应方程式:______.