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.


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