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【单选题】
水准仪的i角是指( )二者在竖直面(与视准轴平行)上的投影交角。A.
水准管轴与视准轴
B.
竖轴与视准轴
C.
纵丝与视准轴
D.
圆水准器轴与视准轴
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【单选题】T he passengers ______ out of the exit when we arrived at the airport.
A.
were just coming
B.
just come
C.
are just coming
D.
just came
【单选题】T he Locomotion No.1 is the ___ steam locomotive ( 蒸汽机车) to carry passengers and goods on a public rail line in 1825.
A.
first
B.
one
C.
early
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