问题
选择题
| Maria has _____ trouble _____ math, so she often asks her math teacher for help. |
A. much; understanding B. no; with C. many; understanding D. not; to understand |
答案
答案：A
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| Maria has _____ trouble _____ math, so she often asks her math teacher for help. |
A. much; understanding B. no; with C. many; understanding D. not; to understand |
答案：A
及S分别表示样本均值和均方差，则