问题
单项选择题
对于可区分的类别数，下面说法正确的是：（）。
A.当类别数至少为5时，可区分类别才能得到满足要求的测量系统
B.当类别数至少为4时，可区分类别才能得到满足要求的测量系统
C.当类别数至少为3时，可区分类别才能得到满足要求的测量系统
D.当类别数至少为2时，可区分类别才能得到满足要求的测量系统
答案
参考答案：A
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对于可区分的类别数，下面说法正确的是：（）。
A.当类别数至少为5时，可区分类别才能得到满足要求的测量系统
B.当类别数至少为4时，可区分类别才能得到满足要求的测量系统
C.当类别数至少为3时，可区分类别才能得到满足要求的测量系统
D.当类别数至少为2时，可区分类别才能得到满足要求的测量系统
参考答案：A
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| My husband had just bought a new washing machine for me. I decided to use it the 1 day and I washed a lot of things. Everything worked 2 , but I couldn't find 3 of my husband's socks though I had looked 4 for it. The next morning, I got ready for 5 as usual, when the bell rang , the students came in. I greeted them and told them 6 we were going to do 7 .When I 8 back to write on the blackboard, the class burst out 9 . They laughed and laughed. They laughed so much, in fact, that I was 10 the headmaster would come and see all this. I asked the class to 11 ,but the more I talked, the more they laughed. 12 I thought I had better pay 13 attention to them and 14 to write on the blackboard. As I did this, they laughed even harder. Before long, the teacher who had the room next to 15 came to see what all the laughter was 16 . When he came in, he started laughing, too. "Good Heavens! "I said," Will 17 please tell me what is so 18 ?" "Oh, God, "said the teacher," You have a brown 19 stuck to the back of your shirt." So that's 20 I found my husband's missing sock. "Oh, well," I said to the class, "Let' s just say you have had an unforgettable lesson on static electricity (静电)." | ||||
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