【Daily Topic】【Civil Engineering Version 20160526】
Thread Content
Participation reward: 2 Wealth. Reward for correct answer: 9 wealth. Correctness check: To ensure tight bonding between the upper and lower layers of concrete in layered pouring, the vibrator should be inserted into the lower layer (the freshly poured concrete) to a depth of at least 50 mm. （ ）
To ensure a tight bond between the upper and lower layers of concrete in layered pouring, the vibrator should be inserted into the lower layer (the freshly poured concrete) to a depth of at least 50 mm. Right
To ensure a tight bond between the upper and lower layers of concrete poured in layers, the vibrator should be inserted into the lower layer (the freshly poured concrete) to a depth of at least 50 mm. (√)