—Let's________.
A:put him up
B:set him up
C:cheer him up
D:clean him up
-- What are you going to do this afternoon?
-- .
写出反义词
压力—____ 结束 —____ 漂亮—____
①水→氢气+氧气 ②氢气+氧气→水 ③酒精+氧气→水+二氧化碳 ④氧化汞→汞+氧气
其中属于化合反应的是:(填序号)____.属于分解反应的是:____,属于氧化反应的有:____.