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问题
选择题
I'll _______ later today.
A. ring her up
B. ring up her
C. call her to
D. call up her
答案
答案:
A
填空题
已知圆的方程为x
2
+y
2
=1,则经过圆上一点M(x
0
,y
0
)的切线方程为x
0
•x+y
0
•y=1,类比上述性质,可以得到椭圆x
2
+2y
2
=8上经过点(2,-
2
)的切线方程为______.
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名词解释
治安检查
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