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【单选题】
视差产生的原因是( )A.
观测时眼睛位置不正
B.
前后视距不相等
C.
目标成像与十字丝分划板平面不重合
D.
眼睛疲劳
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皮皮学刷刷变学霸
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【简答题】田间排水系统按空间位置可分为（）和竖井排水二大类。
【单选题】Historically, Ireland has been free of ethnic conflicts because of its ______.
A.
racial unity
B.
racial homogeneity
C.
multi-culturalism
D.
high rate of emigration
【简答题】In Ireland, following the collection of a 15 euro cent per bag tax, plastic bag usage has dropped by ______.
【简答题】Ireland has a lot to offer the traveler besides its famously green countryside and popular traditional music. It is rich on【M1】______ prehistoric and Medieval ruins, fine Georgian architecture, and ar...
【单选题】Ireland has the following demographic features EXCEPT ______.
A.
a late marriage age
B.
an excess of females in the population
C.
a high proportion of bachelors and spinsters of all ages
D.
a low birthrate compounded by a century of emigration
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