In case of any loss or misfortune it is the duty of（）to take such measures as may be reasonable for the purpose of averting or minimizing a loss which would be recoverable under this insurance. ["the Assured and their servants and agents","the Assurer and his servants and agents","the Charterer and his servants and agents","the Operator and his servants and agent"]
LAN Switch工作在TCP/IP模型中的哪一层（）。
根据上级颁发的（）编制企业各类设备的现场运行规程、制度，经总工程师批准后执行。 ["规程","制度","反事故技术措施","和设备厂商的说明书"]
风管制作安装的工程量如何计算？
注水井分层测试的方法有（）。 ["机械式压力计测试和电子压力计测试","井下流量计测试和投球测试","投球测试和电子压力计测试","井下流量计测试和电子压力计测试"]
通信电源为什么要接地线？其作用？
