A.標(biāo)稱焦點(diǎn)一實(shí)際焦點(diǎn)×cosθ
B.標(biāo)稱焦點(diǎn)一實(shí)際焦點(diǎn)×sinθ
C.實(shí)際焦點(diǎn)一標(biāo)稱焦點(diǎn)×sinθ
D.實(shí)際焦點(diǎn)一標(biāo)稱焦點(diǎn)×cosθ
E.標(biāo)稱焦點(diǎn)一實(shí)際焦點(diǎn)×θ
A.75%
B.80%
C.85%
D.90%
E.95%