题目

Once upon a time, there was a happy monkey in the forest, eating delicious fruit when hungry and resting when tired. One day he got up very early and came to a house, where he saw a bunch of the most beautiful bananas he had ever seen. He took one in each hand and ran back into the forest. He sniffed the bananas but smelled nothing. He tried to eat them but hurt his teeth. The bananas were made of wood, but they were beautiful. When he saw other monkeys, he held on them even tighter (牢牢地). The little monkey took great pride in his bananas. He loved them so much that he didn’t e设NA为阿伏加德罗常数的值。下列叙述正确的是A．1.7 g H2O2中含有的电子数为0.9 NAB．1 L 1 mol·L-1NH4Cl溶液含有NA个NH4+C．1 mol NaHSO4晶体中含有3NA个离子D．含NA个Na+的Na2O溶解于1 L水中，Na+浓度为1 mol·L-1