问题
多项选择题
参加场外交易的证券商包括（）。
A.证券经纪商
B.会员证券商
C.非会员证券商
D.证券承销商
E.专门买卖政府债券、地方政府债券及地方公共罢休债券的证券商
答案
参考答案：B, C, D, E
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参加场外交易的证券商包括（）。
A.证券经纪商
B.会员证券商
C.非会员证券商
D.证券承销商
E.专门买卖政府债券、地方政府债券及地方公共罢休债券的证券商
参考答案：B, C, D, E
I was on a long drive last weekend and stopped for a rest．At that moment,I noticed a man in a wheelchair by the stop sign．He held a sign in hand， “Trying to make it home for the holidays”．I looked away from it,because I had no to give him．I watched as people drove by,and either ignored him or stared at him he was a curiosity（怪人）of sorts．I felt really for the poor man． I know some people wouldn’t like to have the thought of money to such strangers in the street,because they thought these people may use that money for drugs,alcohol,or some other undesirable（不良的） ．I started to drive my car away but soon ．Since I don’t usually have much cash on me,I it would be a good idea to offer some food ．So I asked him if he was ．Hearing my words,he seemed shocked that someone his well-being,but he happily it．He said he would like a sandwich and a can of soda． Inside the store,I bought a sandwich,soda,some water and chips．I them to the new friend who was quite to receive so many delicious foods． the meal time ,I asked his name．He said he was called Chewie,and he was thankful for my help．I him a Smile Card．He read it with a big smile and said,“I always random（偶然）acts of kindness．” As I drove away,I said a silent prayer（祈祷）that Chewie makes it home for the holidays,or at least he spends them somewhere safe and ．
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在T℃时，某NaOH稀溶液中c(H＋)＝10－a mol·L－1，c(OH－)＝10－b mol·L－1，已知a＋b＝12。向该溶液中逐滴加入pH＝c的盐酸(T℃)，测得混合溶液的部分pH如下表所示：
| 序号 | NaOH溶液体积 | 盐酸体积 | 溶液pH |
| ① | 20.00 | 0.00 | 8 |
| ② | 20.00 | 20.00 | 6 |
假设溶液混合前后的体积变化忽略不计，则c为（ ）
A.1 B．4 C．5 D．6