命题“∀x∈R，x²-2x+2≤0”的否定为（　　）

A．∃x∈R，x²-2x+2＞0

B．∃x∈R，x²-2x+2≥0

C．∃x∈R，x²-2x+2≤0

D．∃x∈R，x²-2x+2≥0

Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.

A.Greenwich celestial meridian

B.hour circle of the body

C.local celestial meridian

D.vertical circle of the body