It can be add protection circle to increase protection grade: IP54.
可另加防护圈，提高防护等级为IP54。
Protection grade; Indoor using, submerged in water do not last for long.
防护等级；室内使用，不可长期浸在水中。
In addition, the fire protection grade is good, and can not be burnt under the condition of heat.
另外防火等级好，能够在热的条件下不燃。
This paper discusses the design methods of high-grade highway in water source protection area.
论述了水源保护区高等级公路的设计方法。
This paper discusses the design methods of high-grade highway in water source protection area.
论述了水源保护区高等级公路的设计方法。
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