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问题
单项选择题
锚杆与锚索各有不同,锚杆一般都较短,不超过( )m。
A.5
B.10
C.15
D.20
答案
参考答案:
B
选择题
— How many pencils would you like, Madam?
— Well, I want ______ of these.
A. three dozen
B. three dozen of
C. three dozens
D. three dozens of
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解答题
二次函数的图象过点(1,0),(-3,0),(0,3),求函数解析式.
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