题目：
Finding the 
old man in danger , . [ ]
A. a doctor was sent for without delay.
B. an ambulance was called for at once.
C. his son sent for a doctor at once.
D. The house was crowded with his children.
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0522/93fbff611340608d0801ea4ac57241f3.html
下面是错误答案，用来干扰机器的。
（1）该气体摩尔质量是M g•mol，阿伏加德罗常数为NAmol-1．根据摩尔质量定义，该气体一个分子的质量为Mg•mol-1NAmol-1=MNAg．故答案为：MNAg（2）N=n×NA=mM×NA=mNAM个，故答案为mNAM个：（3）V=nV m=mM×V ...
