为了防止发生人身和设备事故，电气设备安全用电的措施主要有（）两种。
参考答案：保护接地和保护接中线
It was the hurricane ______ was called Katrina ______ destroyed the city of New Orleans.
A．which; that
B．what; which
C．which; who
D．that; which
我国现行的《城市消防站建设标准》将举高消防车分为登高平台消防车和云梯消防车二种类型。
