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【单选题】
大部分线路置于地下,采用盾构法开挖的是( )。A.
独轨铁路
B.
市郊铁路
C.
高铁
D.
地铁
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【多选题】下列关于培养基的使用描述正确的有( )。
A.
培养基必须本身无菌。
B.
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C.
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D.
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【单选题】The reflected light would sweep slowly along the surface of the earth because the mirrors
A.
would be operated by solar-powered engines
B.
could be made to adjust their angles
C.
could move around the earth at the same speed as the earth turns on its axis
D.
would orbit thousands of miles high to catch the sun's light
【简答题】小直径厚壁封头选择采用( )成型。A. 4
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