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【单选题】
“荷花荷叶挨挨挤挤的,像一个个碧绿的大圆盘。”这句话写出荷叶的特点是( )A.
多、圆
B.
多、圆、绿
C.
大、多、绿和圆
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举一反三
【单选题】Fibrous pericardium
A.
Upward attached to the large vascular roots and with its outer membrane continued
B.
All of its anterior surface are covered by pleura
C.
Superior vena cava is out the pericardium
D.
Both sides affixed to visceral pleura
E.
Consist of a thin and smooth serosa
【简答题】关系代数运算中,专门的关系运算有 、 、 。
【单选题】Which of the following statements is INCORRECT regarding the globular and fibrous proteins?
A.
Fibrous proteins have their polypeptide chains arranged in long strands or sheets.
B.
Most globular proteins provide support, shape, and external protection to vertebrates.
C.
Globular proteins often contain several types of secondary structure.
D.
Fibrous proteins generally consist of one type of secondary structure.
【简答题】关系代数运算中, 专门的关系运算有 、 和 。
【单选题】Which method would NOT increase the strength of a fibrous protein?
A.
increasing the number of coiled-coils in the supercomplex
B.
increasing the number of Pro residues in the polypeptide
C.
All of these methods could increase the strength of a fibrous protein.
【单选题】知觉者从环境中一个个细小的感觉信息开始, 将它们以各种方式加以组合,便形成了知觉。这种加工是( ) 的加工。
A.
自上而下
B.
自下而上
C.
自下而下
D.
自上而上
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