Ruby

– You are expecting a visit from some English-speaking friends who have not visited your city before. – You are writing a letter to them. – Tell them

Bởi

– You are expecting a visit from some English-speaking friends who have not visited your city before. – You are writing a letter to them. – Tell them how people in your city are preparing for our traditional Tet holiday. Say what interesting activities will take place in these traditional holidays, and tell them about … Đọc tiếp

Bài 1 1/2 nguyên tử C có khối lg bằng bao nhiêu gam ? từ đó tính : -nguyên tử O – _________ Na -___________Cu -___________P bài 2 Natri có nguyên

Bởi

Bài 1 1/2 nguyên tử C có khối lg bằng bao nhiêu gam ? từ đó tính : -nguyên tử O – _________ Na -___________Cu -___________P bài 2 Natri có nguyên tử khối là 23 đvC trong hạt nhân nguyên tử có 11 p . Sắt có nguyên tử khối là 56 đvC trong hạt … Đọc tiếp