皮皮学,免费搜题
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【单选题】
淀粉酶和淀粉磷酸化酶都可以降解淀粉,但这两种酶所要求的最适温度是不同的,前者要求高温,后者要求低温。在不同的条件下,植物靠不同的酶来起作用,甘薯块根、果实、蔬菜在冬天贮存一段时间会迅速变甜,而香蕉在夏天会迅速变甜。对此的合理解释是() ①低温时,甘薯块根中的淀粉含量降低;高温时,香蕉中的淀粉含量降低 ②高温时,甘薯块根中的淀粉含量降低;低温时,香蕉中的淀粉含量降低 ③高温时,甘薯块根在淀粉磷酸化酶的作用下变甜;低温时,香蕉在淀粉酶作用下变甜 ④低温时,甘薯块根在淀粉磷酸化酶的作用下变甜;高温时,香蕉在淀粉酶作用下变甜
A.
②③
B.
①③
C.
①④
D.
②④
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【单选题】图样上所注的尺寸为该图样所示的() ,否则应另加说明。
A.
留有加工余量尺寸
B.
有关测量尺寸
C.
加工参考尺寸
D.
最后完工尺寸
【单选题】问题:2016年,下列哪种泊位数量同比增长最快?
A.
全国港口万吨级及以上泊位
B.
沿海港口万吨级及以上泊位
C.
全国港口10万吨级及以上泊位
D.
内河港口10万吨级及以上泊位
【简答题】在一个单处理机系统中,存在9个进程,则最多有()个进程处于就绪队列。
【判断题】Collocation refers to a combination of two or more words which frequently occur together, so it’s possible to guess the meaning of the collocation by knowing the meaning of the individual words.
A.
正确
B.
错误
【多选题】巨噬细胞可演变为以下哪些细胞?
A.
泡沫细胞
B.
风湿细胞
C.
伤寒细胞
D.
嗜酸粒细胞
【单选题】____________________. First, many schools require two or more years of foreign language study for graduation. Secondly, learning other languages helps us communicate with people from other countries. ...
A.
In the USA, many students study Spanish language.
B.
It is important to learn foreign languages.
C.
In college, people need to know foreign languages.
【多选题】在完成上次课留下的作业时,你有没有觉得老师坑人,因为以下问题搞不定完全不能算出来!
A.
净跨都没有!
B.
什么是抗震与非抗震?
C.
抗震等级呢?
D.
混凝土强度等级在哪里?
E.
我简直不想看图
F.
找不到图集
【简答题】And besides having an easier time traveling or watching movies without subtitles, knowing two or more languages means that your brain may actually look and work differently than those of your friends.
【单选题】What is the best topic sentence? _____________ _. First, many schools require two or more years of foreign language study for graduation. Secondly, learning other languages helps us communicate with p...
A.
In the USA, many students study Spanish language.
B.
It is important to learn foreign languages.
C.
In college, people need to know foreign languages.
【判断题】宋代达到巅峰并出现转型。
A.
正确
B.
错误
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