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【单选题】
强酸滴定弱碱,以下指示剂不能使用的是( )。A.
甲基橙
B.
甲基红
C.
酚酞
D.
溴酚蓝 (pK In = 4.0)
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【简答题】阅读下面的短文，然后按照要求写一篇150词左右的英语短文。 A peacock was very unhappy with his ugly voice; and he spent most of his days complaining about it. 'It is true that you cannot sing;' said the fox, 'but look how beautif...
【单选题】It's one thing if a scientific experiment goes wrong in a lab, they say, but something else entirely if it winds up on your dinner plate.
A.
appears in the end
B.
annoys
C.
blows away
D.
moves upwards
【单选题】—I won the high jump yesterday. —_______. [ ]
A.
It's a small thing
B.
It's all right
C.
I hope so
D.
Congratulations to you
【单选题】关于蛋白质二级结构α-螺旋的叙述正确的是
A.
天然的蛋白质都是右手α-螺旋
B.
多聚Lys和多聚Ile因为空间位阻效应而不能形成α-螺旋
C.
维持α-螺旋的作用力主要是肽键
D.
α-螺旋中，每个氨基酸残基的羰基氧与前面第四个氨基酸残基的亚氨基氢形成氢键
【简答题】A．It's a new thing and people would like to try it out. B．They have less time to attend traditional classes. C．It would save a lot of money for the students. D．Televised lessons are much easier to und...
【简答题】阅读短文，选择最佳选项。 Many British people like to go bird-watching in their free time. That's why there are many English sayings about birds. Read the following to learn about them. He eats like a bird. This d...
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