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【简答题】
构象与构型有何区别?聚丙烯分子链中碳—碳单键是可以旋转的,通过单键的内旋转是否可以使构聚丙烯变为间同立构聚丙烯?为什么?
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举一反三
【单选题】That everything in the accident happened in slow motion was______.
A.
the result of the mind ’ s regulation
B.
an illusion of the eyes
C.
to delay people ’ s reactions
D.
to accelerate the motion of the world
【单选题】What makes the digital screens possible, according to the passage?
A.
Digital light processing technology.
B.
Use of millions of tiny mirrors on the chip.
C.
The chip capable of moving thousands of times per second.
D.
The American movie entitled Avatar made in Hollywood.
【判断题】Before the spell, everything lived in harmony with one another in the town——a real community in the U.S.
A.
正确
B.
错误
【多选题】what are the types of digital signal?
A.
periodic digital signal
B.
nonperiodic digital signal
C.
positive logic
D.
negative logic
【单选题】( )在插入背景音乐时,使用下面哪种方式控制播放次数为无穷次?
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