利用锚杆把不稳定的岩块固定在完整的岩体上,这是锚杆的()。
A. 悬吊作用
B. 组合岩梁
C. 组合岩拱
D. 系统作用
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用碘量法测定硫一般是用标样进行计算,但也可以根据氧化还原的原理进行理论计算。
A. 正确
B. 错误
依据CRH1A(时速250公里)型动车组二级(专项)修检修计划,外门检查属于()类专项修。
A
B
C
D
Which of the following statements represents the correct action to take when three crew members discover a fire?()
A. One man report the fire, and the other two men fight the fire
B. One man report the fire, one man fight the fire, and one man evacuate and secure the area
C. One man report the fire, one man fight the fire, and one man act as a safety observer
D. All three men fight the fire and report it immediately after it is extinguished
有机磷农药中毒可见()
A. 呼吸抑制
B. 呼吸有蒜味
C. 呼吸有烂苹果味
D. 呼吸有苦杏仁味
E. 呼吸有氨味