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【多选题】
回归系数的t检验中自由度不正确的事A.
1
B.
n-1
C.
n-2
D.
（R-1)(C-1）
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反馈参考答案：
举一反三
【简答题】8水玻璃的成分是什么?什么是水玻璃的模数?水玻璃的模数、密度(浓 度)对其性质有何影响?水玻璃的主要性质和用途有哪些?
【单选题】—Is this your sister? —_______.This is my friend. [ ]
A.
No, it is
B.
No, it isn't
C.
Yes, it is
D.
Yes, it isn't
【简答题】何谓水玻璃“模数”？铸造生产使用水玻璃时，如何提高或降低水玻璃的模数？举例说明。
【单选题】— Is this your sister Joan? — _____. She is my friend Susan. [ ]
A.
Yes, she is
B.
Yes, it is
C.
No, she isn't
D.
No, it isn't
【单选题】Is it polite to ask your friend this question “What is your salary”?
A.
Yes, it is.
B.
No, it isn’t.
【单选题】Is this your brother ? _______.He is my friend ,Tom.
A.
Yes ,this is
B.
No,this isn't
C.
Yes ,it is
D.
No ,it isn't
【简答题】补全对话。 A: 1 . B: Hello, I'm Jack Brown. A: Nice to meet you. B: 2 . A: Is this your friend? B: Yes. A: What's his name? B: 3 . A: Hi! C: Hi! Here's my name card. A: 4 . A. Nice to meet yo...
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