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【简答题】
新掰下的玉米的甜味是由于玉米粒中的糖浓度高。但是掰下的玉米贮存几天后就不那么甜了，为什么？如果将新鲜玉米去掉外皮后浸入沸水几分钟，然后于冷水中冷却，储藏在冰箱中可保持其甜味，为什么？
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反馈参考答案：
举一反三
【单选题】Compared with modern corporations, the corporations of the past were less concerned about
A.
the world outside their business.
B.
women's liberation movements.
C.
the qualifications of the management.
D.
the needs of community and environment.
【简答题】水平接地体一般采用圆钢或（）。
【单选题】Modern athletes' results cannot be compared with those of ancient runners because ______.
A.
details such as the time were not recorded in the past
B.
the Greeks had no means of recording the results
C.
they are much better
D.
they are much worse
【单选题】患者男，46岁，因“左侧面颊部阵发性剧痛2个月”来诊。每次发作为突发性，呈触电样剧痛，持续10余秒，进食可诱发。继发性三叉神经痛的病因不包括（）
A.
肿瘤
B.
囊肿
C.
脱髓鞘病
D.
感染性炎症
E.
特发性面神经麻痹
【单选题】三十八岁的男性半年来出现双手无力和吞咽困难，有时出现发音不清，就诊前1个月出现进行性的咳嗽无力。其程度在一天中没有明显变化，无感觉障碍，性功能、尿便、听力、视力和平衡均无异常。体检发现双手骨间肌明显萎缩，四肢腱反射均增强，双侧巴氏征阳性。该患者的EMG表现应包括（）
A.
纤颤波
B.
神经传导速度显著减慢
C.
感觉神经电位受损
D.
H反射
E.
无异常
【单选题】下列关于长期成本的说法中正确的是( )。
A.
长期成本分为固定成本与可变成本
B.
长期平均成本与边际成本相等时，长期平均总成本最高
C.
长期平均成本函数适合于长期内全部投入是固定成本的情况
D.
长期成本中没有固定成本，一切成本都是可变成本
【单选题】Compared with the old justice concept, modern law as shown in this passage is ______.
A.
less vengeful
B.
less effective
C.
less just
D.
less reasonable
【单选题】Modern athletes' results cannot be compared with those of ancient runners because ______.
A.
the Greeks had no means of recording the results
B.
details such as the time were not recorded in the past
C.
they are much better
D.
they are much worse
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