Đáp án:
Giải thích các bước giải:
CTHH: K2O
PTK :
M K2O= 39.2+16=94
pthh : K2O
PTK=39.2+16=94
Choose the best answer.
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Please turn off ___ lights when you leave ___ room.
I like _____ colorful costumes of ____ ethnic minority people in Vietnam.