问题
多项选择题
设N0为阿佛加德罗常数，下列对0.3M硫酸钾溶液的不正确说法是（）
A.1升溶液中含有0.3N0个钾离子
B.1升溶液中含有钾离子和硫酸根离子总数为0.9N0
C.2升溶液中钾离子浓度为1.2M
D.2升溶液中含有0.6N0个硫酸根离子
答案
参考答案：A, C
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设N0为阿佛加德罗常数，下列对0.3M硫酸钾溶液的不正确说法是（）
A.1升溶液中含有0.3N0个钾离子
B.1升溶液中含有钾离子和硫酸根离子总数为0.9N0
C.2升溶液中钾离子浓度为1.2M
D.2升溶液中含有0.6N0个硫酸根离子
参考答案：A, C
I will never forget the year I was about twelve years old. My mother told us that we would not be 1 Christmas gifts because there was not enough money. I felt sad and thought, “What would I say when the other kids asked what I’d 2 ?” Just when I started to 3 that there would not be a Christmas that year, three women 4 at our house with gifts for all of us. For me they brought a doll. I felt such a sense of 5 that I would no longer have to be embarrassed when I returned to school. I wasn’t 6 . Somebody had thought enough of me to bring me a gift. Years later, when I stood in the kitchen of my new house, thinking how I wanted to make my 7 Christmas there special and memorable, I 8 remembered the women’s visit. I decided that I wanted to create that same feeling of 9 for as many children as I could possibly reach. So I 10 a plan and gathered forty people from my company to help. We gathered about 125 orphans (孤儿) at the Christmas party. For every child, we wrapped colorful packages filled with toys, clothes, and school supplies, 11 with a child’s name. We wanted all of them to know they were special. Before I called out their names and handed them their gifts, I 12 them that they couldn’t open their presents until every child had come forward. Finally the 13 they had been waiting for came as I called out, “One, two, three. Open your presents!” As the children opened their packages, their faces beamed and their bright smiles 14 up the room. The 15 in the room was obvious, and it wasn’t just about toys. It was a feeling –the feeling I knew from that Christmas so long ago when the women came to visit. I wasn’t forgotten. Somebody thought of me. I matter.
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