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【单选题】
Which of the following is NOT mentioned in the passage?A.
New techniques are continually developed and new machines invented for undersea exploration.
B.
If not well built, a submersible is most likely to get crushed in deep water.
C.
A submersible, when manned, looks very like a spaceship.
D.
In certain respects undersea exploration is often faced with the same problem as the space exploration.
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举一反三
【简答题】The girl’s face turned red in shyness when the boy presented her with a red rose.
【简答题】高级形式的国家资本主义就是( )。
【简答题】食品的变色也是一种腐败变质现象。()
【单选题】在五类双绞电缆中传输的信号频率越高，（）。
A.
衰减越小，近端串音衰减越小
B.
衰减越大，近端串音衰减越大
C.
衰减越小，近端串音衰减越大
D.
衰减越大，近端串音衰减越小
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