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函數(shù)y=的圖象是(    )

函數(shù)y=的圖象是(    )

函數(shù)y=的圖象是平面上到兩定點(diǎn)距離之差的絕對(duì)值等于定長(zhǎng)的點(diǎn)的軌跡,則這兩個(gè)定點(diǎn)間的距離為(    )

A.8                        B.4

C.4                        D.2

函數(shù)y=的圖象是

函數(shù)y=的圖象是平面上到兩定點(diǎn)距離之差的絕對(duì)值等于定長(zhǎng)的點(diǎn)的軌跡,則這兩個(gè)定點(diǎn)間的距離為

A.8                                                                 B.4

C.4                                                                 D.2