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Phương trình hóa học: $Ba^{2+} + SO_4^{2-} \xrightarrow[t^o]{p} BaSO_4\downarrow$

Ba^2+^+SO~4~^2-^ → $\xrightarrow[abc]{xyz}$ BaSO~4~ ↓

    **A.** khí     B. lỏng

Phương trình hóa học: $Ba^{2+} + SO_4^{2-} \xrightarrow[t^o]{p} BaSO_4\downarrow$

Ba2+ +SO42- → $\xrightarrow[abc]{xyz}$ BaSO4 ↓

    A. khí     B. lỏng

I have keys but no locks. I have space but no room. You can enter but can't leave. What am I?

A keyboard.

I have keys but no locks. I have space but no room. You can enter but can't leave. What am I?

A keyboard.

Câu hỏi số 2?

Đàn piano.