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【单选题】
以下关于环己烷椅式构象的说法错误的是:A.
椅式构象无角张力，扭转小，无范德华斥力，是能量最低的环己烷构象
B.
室温下环己烷平衡体系内以椅式构象为主
C.
椅式构象中有两种键：a键和e键，取代基处在e键时能量较低
D.
椅式构象有两种构象异构体，在翻转中发生a，e键互换，但这种翻转较困难
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【单选题】No matter where it is used, 'Flextime' system has proved ______.
A.
entirely effective
B.
a complete failure
C.
to be disliked by the employers
D.
too difficult to carry out
【简答题】由于其他预算都需要在销售预算的基础上编制或者大都与销售预算数据有关，因此，销售预算是编制全面预算的关键和起点。 ( )
【简答题】Before relativistic particle physics, the constituents of matter had always been considered as being either elementary units which were indestructible and unchangeable, or as composite objects which c...
【简答题】No matter what the methods we use, the final result is that we will need to decrease CO2emissions by 70% to 0% simply to stabilize ______.
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