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【单选题】
update student set s_name = ’’ where s_id =1 该代码执行的是哪项操作？A.
添加姓名叫的记录
B.
删除姓名叫的记录
C.
返回姓名叫的记录
D.
更新姓名叫的记录
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【单选题】关于米氏常数Km的意义,哪个描述不正确( )
A.
一条代谢途径中Km值最大的酶是限速酶
B.
酶的Km值与浓度有关
C.
Km值与酶底物亲和力成负相关
D.
Km是酶的特征性常数
E.
Km值反应酶的反应速度，反应条件不同，Km值不同
【单选题】米氏常数km的物理意义是:
A.
当酶促反应速率达到最大反应速率四分之一时的底物浓度。
B.
当酶促反应速率达到最大反应速率一半时的底物浓度。
C.
当酶促反应速率达到最大反应速率四分之三时的底物浓度。
D.
当酶促反应速率达到最大反应速率时的底物浓度。
【简答题】The child is clever ________ healthy.
【单选题】The child is clever ________ healthy.
A.
as soon as
B.
as good as
C.
and
D.
as tall as
【简答题】简述米氏常数Km的物理意义。
【单选题】The child is neither old enough nor clever enough to realize the _________ action on his own.
A.
desired
B.
desirable
【判断题】Chinese think no possible gain is achieved by having the child struggle to put a key into box since the child is neither old enough nor clever enough.
A.
正确
B.
错误
【简答题】...since the child is neither old enough nor clever enough to realize the desired action on his own, what possible gain is achieved by having him struggle?
【简答题】... since the child is neither old enough nor clever enough to realize the desired action on his own, what possible gain is achieved by having him struggle?
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