mk được 1960

1. After work, he comes back home and has lunch at a quarter past twelve.

2. In the aftenoon, he does the housework and plays game.

3. In the evening after dinner he watches T.V or reads book.

1, David had gone before we arrive.

=> Before we arrive, David had gone.

2, We had lunch then we took a look around the shops

=> Before we took a look around the shops, we had lunch.

3,The light had gone out before we got out of the office

=> When we got out of the office, the light had gone.

4, After she had explained everything cleary, we started our work.

=> By the time she had explained everything cleary, we started our work.

5, My father had watered all the plants in the garden by the time my mother came home.

=> Before my mother came home, my father had watered all the plants in the garden.

số đó là : 10x3x2x3x2=360

1) They were working in the garden from 3 o'clock to seven o'clock.

2) Carol got married in 1994.

3) They have lived here for 20 years.

Điện phân 400 ml dung dịch CuSO₄ 0,2M với cường độ I = 10A trong thời gian t, ta thấy có 224 ml khí (đktc) thoát ra ở anot. Giả thiết rằng điện cực trơ và hiệu suất điện phân bằng 100%. Khối lượng catot tăng lên là

A. 1,28 gam.

B. 5,12 gam.

C. 2,11 gam.

D. 3,10 gam.

Quan sát hình 7 rồi điền vào bảng sau: