题目

Have you ever been to London? Here is some hotel information for you.Kingsway Hall Hotel We offer quality service (优质服务) in Kingsway Hall Hotel. This location puts guests in easy reach of many places, such as the British Museum and Piccadilly Circus. Our hotel also has modern Western food, and offers a perfect dining environment. The lounge bar is a comfortable place to enjoy a drink while watching the tourists. There are hundreds of dining choices within walking distance. Non-smoking rooms are ready for guests. Hilton Docklands Riverside Located on the bank of the Thames, our hotel i有关尿素[CO（NH2）2]的说法正确的是（ ）A．尿素的相对分子质量为：12+16+14+1×2×2=46B．尿素是由碳、氢、氧、氮、四种元素构成C．尿素中碳、氧、氮、氢四种元素的质量比为：12：16：14：1D．尿素中氮元素质量分数的计算式为：×l00%