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Students are always interested in finding out ________ they can go with a new teacher. [ ]
1年前
I turned to bookshops and libraries looking for information and found _______.
1年前
某雷达装置发射的电磁波信号的波长为6×103m.问该信号的传播速度是多少?频率是多少?
1年前
已知公差不为0的等差数列{an}满足a1,a3,a4成等比关系,Sn为{an}的前n项和
1年前
若(3m-2)x2yn+1是关于x,y的系数为1的五次单项式,则m=______,n=______.
1年前