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圆的方程

圆的方程. 1 ．方程 x(x 2 +y 2 － 3)=0 与 x 2 +(x 2 +y 2 － 3) 2 =0 表示的曲线是（） A ．都表示一条直线和一个圆 B ．都表示两个点 C ．前者是一条直线和一个圆，后者是两个点 D ．前者是两个点，后者是一条直线和一个圆. 2 ．过圆 x 2 +y 2 =4 外一点 M （ 4 ，－ 1 ）引圆的两条切线，则经过两切点的直线方程为（） A ． 4x+y － 4=0 B ． 4x+y+4=0 C ． 4x － y+4=0 D ． 4x － y － 4=0.

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Figure 1: P1166 License Location and Apache 3D Seismic Coverage

01 ° 00’ 00”. 01 ° 24’ 00”. 01 ° 48’ 00”. 60 ° 40’ 00”. PGS Phase 1 3D acquisition. 3/12b (P1166). MTEM 2D Resistivity Line. 60 ° 30’ 00”. 3/17 (P1166). Apache held licenses post partial relinquishment. PGS Phase 2 3D acquisition. 60 ° 20’ 00”. N. Seismic survey outlines.

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