累计位移量已达极限位移的_____,且仍未出现收敛减缓的迹象,可视为隧道失稳先兆。
— ___________________
— Once or twice a week.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
应用叠加原理求位移时应满足的条件是________。
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