【简答题】关系代数运算中,专门的关系运算有 、 、 。
【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( )。
【多选题】猪膘肉,琵琶肉是( )等民族有名的腌肉制品,肉色油亮鲜红,肉味浓烈香鲜。
【判断题】连接器件一般是指用于连接电缆线对和光纤的一个器件或一组器件。
【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.
【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.
【简答题】纤维性修复(fibrous repair)