THDS-A探测系统外探探测角度是()
A.仰角为45º,偏角为3º
B.仰角为50º,偏角为3º
C.仰角为45º,偏角为0º
D.仰角为50º,偏角为0º
参考答案:A
---Who is the tallest boy? ---It ______ be John. John is of medium height.
A.must
B.needn’t
C.might
D.can’t
中秋节被正式定为节日是在()代初年,中秋节寄托了人们“花好月圆人团聚”的祈望,因此也叫团圆节
A.隋
B.唐
C.宋
D.元