A.晚9點(diǎn)至次日早7點(diǎn) B.晚l0點(diǎn)至次日早7點(diǎn) C.晚9點(diǎn)至次日早6點(diǎn) D.晚10點(diǎn)至次日早6點(diǎn)
A.5 B.10 C.15 D.20
A.1.5 B.1.8 C.2.0 D.2.5