两条方位船位线定位,两船位线交角取值范围为()。
A.60°~120°
B.30°~60°
C.30°~150°
D.60°~90°
参考答案:C
– How much wine is left in the bottle standing on the table?
– ________
A.No one
B.None
C.Nobody
D.Nothing
浑天说的代表人物是( ),他鉴于东汉地震频繁,创造了候风地动仪,以测定地震的方位。
A.唐都
B.落下闳
C.邓平
D.张衡