在一个急停继电器的技术参数页上,您看到以下一资料。 - Emergency stop - push button with two NC contacts - Degree of protection according to IEC 529 Terminals: IP 20 Housing: IP 40 对上述资料的内容,以下哪一个描述是正确的?
【单选题】The price of Cisco Small Business Pro Service is based on the complexity of the device that is being covered. How many different price points for these devices are available?()