HOC24
Lớp học
Môn học
Chủ đề / Chương
Bài học
''____?'' Jonh's brother advised him
a why don't you try again
b why do you try again
c why did you try again
d why must you try again
____ from your seminars
a shoud you be absent on no account
b shoud you be absent on any account
c on no account you should be absent
d on no account should you be absent
dẫn khí h2 qua m(g) fe2o3 thu được n(g) fr tác dụng với hcl sinh ra 2,8(l) h2 (đktc) tính m,n