Đáp án: CTHH: H2SO4
PTK:M=1x2+32+16x4=98
Giải thích các bước giải:
Đáp án:
A H2SO4
Chỉ số nguyên tố viết nhỏ dưới chân
B 1×2+32+16×4=98 đvC
31. My mother took me to the zoo yesterday
…………………………………………………………………………….
32. Blair invented a color television in 1928.
33. John gave me these records last week.
34. Our club holds meetings once a month.
35. She doesn’t find anything in that box.
Choose the best answer.
We are looking for ____ place to spend ____ night.
Please turn off ___ lights when you leave ___ room.
I like _____ colorful costumes of ____ ethnic minority people in Vietnam.