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We are looking for someone who is __________ (可靠的) and hard-working.
1年前
I want to borrow the book, but I don’t know how long it may _______.
1年前
用括号内动词的适当形式填空She ____(work) in a bank since she left school.
1年前
已知二次型f(x1,x2,x3,x4)通过正交变换化为标准型y1^2+2y2^2-3y3^2,则该二次型的符号差是多少,求详解.
1年前
如图, AB ∥ CD , AB=CD .求证: AD=BC
1年前