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【单选题】
N 型半导体的自由电子数目多于空穴,整体而言,N型半导体呈现的电性为( )。A.
负电性
B.
正电性
C.
电中性
D.
无法确定
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举一反三
【简答题】表单的提交方法包括______和post方法。
【简答题】Mount Kilauea is an active volcano, which continuously releases lava to ______.
【单选题】Which of the following statements is not true regardingthe active site of an enzyme?
A.
An active site is normally a hollow or cleft on the surface of an enzyme.
B.
An active site is normally hydrophilic in nature.
C.
Substrates fit into active sites and bind to functional groups within the active site.
D.
An active site contains amino acids which are important to the binding process and the catalytic me
【简答题】表单的提交方法包括 post 和______ 方法
【多选题】Which three attributes are carried in a source active message?（）
A.
NLRI information
B.
IP address of originating RP
C.
address of multicast source
D.
all active RPs in the local domain
E.
group address to which the source is sending
【单选题】Which of the following statements about active center of enzyme is not true
A.
Binding of enzyme with substrate is limited to the small area of enzyme structure which is closely related to enzyme activity.
B.
The essential groups may locate either in or outside the active center.
C.
Usually consists of several amino acid residues adjacent to each other in the primary structure
D.
Zymogen activation is actually the process of forming complete active center.
E.
Binding of substrates can induce conformational change of the active center of enzyme.
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