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【单选题】
一般只要超声界面的大小大于超声波的半波长时,就会产生( )。而若界面小于半波长时,则会产生( )A.
透射
B.
折射
C.
反射
D.
绕射
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举一反三
【单选题】How many workers are included in the survey conducted by Owl Labs?
A.
65
B.
1202
C.
62
D.
49
【简答题】保税仓库内的寄售维修零配件申请以保修期内免税出仓的，进口货物报关单的“贸易方式栏”填______，并确认维修的原设备进口不超过______。
【单选题】保税仓库内的寄售维修零配件申请以保修期内免税出仓的，进口货物报关单的“贸易方式”栏填_____，并确认维修的原设备进15不超过年。
A.
无代价抵偿货物；3
B.
无代价抵偿货物；1
C.
修理货物；3
D.
修理货物；1
【单选题】夏、商、西周三个王朝都历经数百年 ,但最终都没有摆脱灭亡的命运,它们灭亡的共同原因是( )
A.
建国者没有打好基础
B.
不注意与周边少数民族的关系
C.
后期统治者昏庸暴虐
D.
内部发生严重叛乱
【单选题】Are there many workers in a modern technological society according to the author?
A.
No. According to the author, not every one can become a worker.
B.
No. According to the author, only sixty per cent of the population can be called workers.
C.
No. According to the author, the figure of the workers is not big now, but it can become larger in the future.
D.
Yes. According to the author, there are many workers in a modern society.
【单选题】－How many workers are there in your factory? －______ the workers in my factory_______ over two thousand .
A.
The number of , is
B.
The number of , are
C.
A number of, is
D.
A number of , are
【单选题】In the tropics, bumblebee colonies last for many years, but in temperate regions the workers and the drones die in the fall.
A.
finally
B.
endure
C.
recent
D.
continue
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