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1. |
Reinforced concrete door and window frames can be compacted using :1. needle vibrator2. plate vibrator3. form vibrator4. tappingThe correct sequence of these equipment in order of preference (from the best to the worst) is |
A. | 2, 3, 4, 1 |
B. | 3, 2, 1, 4 |
C. | 2, 3, 1, 4 |
D. | 3, 2, 4, 1 |
Answer» E. | |