A.±30° B.±45° C.±90° D.±120°
A.15~85 B.25~95 C.15~95 D.25~85
A.每天0點(diǎn)至6點(diǎn)間 B.每天6點(diǎn)至24點(diǎn)間 C.每天9點(diǎn)至17點(diǎn)間 D.全天