已知,a+b=4n+2,ab=1,若19a2+147ab+19b2的值为2009,则n=( )。
2或-3
-My father with my grandparents _______ Shanghai.
-Really? _______ will they come back?
A.have been to; How soon
B.has been to; How long
C.has gone to; How soon
D.has gone to; How long
医学伦理学公正原则的本质是对病人()
A.充满爱心
B.细心负责
C.一视同仁
D.耐心周到