[Engineering Version] Daily Question 20180102
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In the construction of bolted shotcrete tunnels, the frequency of monitoring the surrounding rock and support conditions is generally ( ). A. 1–2 times per day B. 1–2 times per shift C. 1–2 times per week D. 1 time every 2 days Correct answer: B
In shotcrete tunnel construction, the frequency of monitoring the surrounding rock and support conditions is generally ( B ). A、1–2 times per day B、1–2 times per shift C、1–2 times per week D、1 time every 2 days