【单选题】设对某角观测一测回的观测中误差为 ± 3 ′′ ,现要使该角的观测结果精度达到 ± 1.4 ′′ ,需观测 ( ) 个测回
【单选题】We ________ John's name on the race list yesterday but for his recent injury. [ ]
【简答题】.______recent developments we do not think your scheme is practical. A) In view of B) In favor of C)In case of D)In memory of
【单选题】Fascist dictatorships differ from monarchies of recent times in
A.
setting limits to their scope of action
B.
effecting results by sheer momentum
C.
rivaling the state in power
D.
exerting constant pressure on liberties
E.
eradicating people's organizations
【单选题】Who located the Lost Sea in recent times? 查看材料
【简答题】We know that in early times messengers carried letters from place to place.(1)In Europe, however, it was not until the fifth century that a regular system of taking letters between towns was start...
【单选题】设对某角观测一测回的中误差为±3′′,要使该角的观测精度达到±1.4′′,至少需 观测( )个测回。