问题
选择题
Miss White, please keep visitors off the meeting-room. A secret plan______ there.
A．is made
B．was made
C．is making
D．is being made
答案
答案：D
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Miss White, please keep visitors off the meeting-room. A secret plan______ there.
A．is made
B．was made
C．is making
D．is being made
答案：D
；平洞开挖时有点滴状出水；岩体结构面产状变化大，无优势结构面；围岩最大重分布应力σmax=19MPa，则该岩体基本质量级别可初判为（）。