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chodom11102001
2 năm trước
Câu 24: Người ta dùng một máy bơm có công suất 750W để bơm nước lên độ cao 20m. Cho bơm chạy trong 1 giờ thì bơm được bao nhiêu m ³ nước? Biết khối lượng riêng của nước là 1000kg/m ³, hiệu suất của máy bơm là 80%. A. 108m ³ B.10,8m ³ C. 13,5m ³ D. 16,875m ³
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