A.25% B.50% C.75% D.100%
A.距入射點(diǎn)約50.2mm、埋深38.6mm處 B.距入射點(diǎn)約56.5mm、埋深43.4mm處 C.距入射點(diǎn)約70.4mm、埋深22.3mm處 D.距入射點(diǎn)約80.1mm、埋深.16.5mm處
A.14° B.22° C.32° D.45°