Tháng Hai 3, 2026

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…..noodles last night?

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in the following question. She was unhappy that she lost contact with a lot of her old friends when she went abroad to study.

Dung dịch A có pH < 7 và tạo ra kết tủa khi tác dụng với dung dịch Bari nitrat Ba(NO$_{3}$)$_{2}$. Chất A là: