单项选择题

A.Ng=(0.1+0.35sinλ)(0.4±0.2)2T
B.Ng=(0.1+0.35sinλ)(0.4±0.2)T
C.Ng=(0.2+0.35sinλ)(0.4±0.2)T
D.Ng=(0.1+0.35sinλ)(0.4±0.1)T