拆除工程施工现场区域内地下的各类管线，施工单位应在地面上设置明显标志。
参考答案：对
By______, they mean that individuals of one culture have to go through the process of modification in attitudes, knowledge and behavior in order to function well in another culture.
A．Cognitive theory
B．Suggestopaedia
C．Acculturation theory
D．LAD
油泵吸入管路上的底阀是（）。
A.逆止阀
B.闸阀
C.安全阀
D.压力表阀
