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tramhaha
2 năm trước
một hợp chât có phân tử nguyên tố X liên kết với 2 nguyên tử hidro và nặng hơn phân tử hidro là 17 lần 1.tính phân tử khối hợp chất 2.tính nguyên tử khối X cho biết trên và kí hiệu hóa học
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Các câu hỏi liên quan

1 Complete the passage with a suitable preposition Complete the passage with a suitable preparation : we have English lessons (1)________Rom 12 . There are 24 tables for students and one desks for the teacher. (2)_________ the walls, there are a dots of posters of England. There ‘s a cupboard at the front of the room and (3)________ the cupboard, there is a TV and DVD player . Sometimes we watch films .There are some bookshelves ____________the classroom.__________the shelves . there are a lot of English books. Our books are___________the teacher's desk . He want to look at our home work . Our school bags are__________the floor and there is some food _____________the school bags . It's now 5.30 pm . We are _______home , but our teacher is __________school . He often stays late to prepare for tomorrow's lessons

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