第4题
A、锚杆和锚固区岩体相互作用形成统一承载结构
B、锚杆支护可提高锚固体力学参数
C、锚杆支护可显著提高锚固体峰值强度和残余强度
D、锚杆支护可改变围岩应力状态,增加围压
第5题
A、A. Generally speaking, the guide should accept the request immediately.
B、B. The guide should report to the travel service for permission and follow the directions of the travel service.
C、C. Let the tourist leave enough cash with the guide. The travel service will refund the balance.
D、D. The guide mails the receipt, consignment form and consignment receipt to the client upon approval of the travel service. The travel service keeps the copies of these documents for check.
第8题
A、与某组分形成一个新的具有最低恒沸点的混合物
B、用溶解度的差异来分离原两组分
C、改变原两组分的相对挥发度
D、与某组分形成一个新的具有最高恒沸点的混合物
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