题目

某元素的一种同位素X的原子质量数为A，含N个中子，它与1H原子组成HmX分子。在a g HmX中所含质子的物质的量是( ) A. (A－N＋m) mol                B. (A－N) mol C. (A－N) mol                    D. (A－N＋m) mol 答案：AThe hospital has recently obtained new medical equipment, _____ more patients to be treated.A. being allowed B. allowing C. having allowed D. allowed