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【单选题】
对于光的波粒二象性的理解正确的是 ( )A.
电磁波谱中,波长最长的只表现波动性,波长最短的只表现出粒子性
B.
光子与电子是同一种粒子,光波与机械波是同一种波
C.
光的波动性是由于光子间的相互作用而形成的
D.
光是一种波,同时也是一种粒子,光子说并未否定电磁说
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【简答题】You are going to hear a passage about High-speed rail (HSR) in China. Listen carefully and fill in the missing information.
【简答题】大地水准面差距
【简答题】大地水准面差距
【简答题】大地水准面差距?
【单选题】大地水准面差距是指( )。
A.
似大地水准面和大地水准面之间的差距
B.
两个国家的大地水准面的差异
C.
就是地面点到大地水准面的垂线距离
D.
就是大地水准面和椭球面之间的垂线距离
【简答题】As a form. of synergy, what are available between high-speed rail stations and major airports?
【判断题】President Barack Obama had planned to develop high-speed rail (HSR) systems across the United States, but it has met resistance.
A.
正确
B.
错误
【判断题】HSR is a type of passenger rail transport that operates faster than the normal speed of rail traffic.
A.
正确
B.
错误
【单选题】After this accident we are ______ concerned with the safety of travelling by high-speed rail. [ ]
A.
little
B.
less
C.
much
D.
more
【简答题】You are going to hear a passage about High-speed rail (HSR) in China. Listen carefully and fill in the missing information.补录3High-speed rail (HSR) in China refers to any railway in China with 1. ...
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