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【单选题】
高大乔木成龄树的树冠冠径( )m。A.
10-15
B.
5-10
C.
3-7
D.
4-8
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【简答题】A．They want to change the way English is taught. B．They know clearly what they want to learn. C．They want to have an up-to-date knowledge of English. D．They learn English to find well-paid jobs.
【简答题】A.Because they want to retum to the job market． B.Because they want to leam something new． C.Because they want to make up for the education they missed． D.Because they want to prove themselves to be u...
【简答题】A.Because they want to travel to broaden their horizon. B.Because they want to explore what they are interested in. C.Because they need to go back to serve military duty. D.Because they need to recove...
【单选题】蛋白质的三级结构是指( )
A.
多个亚基所构成的空间构象
B.
蛋白质所有原子的空间排布
C.
蛋白质主链分子的空间构象
D.
蛋白质分子中氨基酸的排列顺序
E.
以上都不对
【简答题】A．They want to give orders to the other. B．They want to know more than the other. C．They want to gain respect from the other. D．They want to get the other to behave properly.
【单选题】蛋白质的三级结构是指（）
A.
蛋白质的氨基酸顺序
B.
数条肽链之间相互作用形成的一个结构
C.
不同二级结构区域在空间上的折叠组合，即蛋白质的空间构象
D.
蛋白质的糖链修饰
E.
规则重复的折叠形式，通常包括α螺旋和β折叠
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