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【单选题】
稳压管的稳压区是二极管工作在 状态。A.
正向导通
B.
反向截止
C.
反向导通
D.
反向击穿
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举一反三
【单选题】It shows that____ knowledge of first aid can make a real difference.
A.
a
B.
the
C.
one
D.
/
【简答题】When someone has a lot of knowledge and experience, we say they have e___e.
【单选题】It knowledge is power, Sir Francis Bacon wrote in 1579, perhaps creativity ca be described as the ability to use that power.
A.
what; and
B.
as; then
C.
which; and
D.
that; then
【单选题】If you describe someone as having ______, you think that they have a good understanding and practical knowledge of something.
A.
resentment
B.
chore
C.
restriction
D.
savvy
【单选题】By 'internal computers' the author means______.
A.
a person' s store of knowledge and the ability to use it
B.
computers used by a company for its own business dealings
C.
the most up-to-date computers a company can buy
D.
computers which are very reliable
【简答题】谷氨酰胺合成酶的活性可以被 ________________ 共价修饰调节;糖原合成酶、糖原磷酸化酶等则可以被 ________________ 共价修饰调节。
【单选题】The manager needs an assistant with knowledge of French and work experience.
A.
the; a
B.
不填; the
C.
a; 不填
D.
the; 不填
【单选题】当测定某一酶活性时,要求有合适的反应条件,影响酶促反应速度的各种因素应该相对恒定。 反应体系中,底物的量要充足,使酶被底物完全饱和,以充分反映待测酶的活力。但过高的底物浓度可能会抑制酶的活性。 根据反应时间选择反应的最适温度 根据不同底物和缓冲液选择最适的 pH 值 为了获得最大的反应速度,在反应体系中应适当添加辅助因子、激活剂等。
A.
过氧化物酶
B.
水化酶
C.
谷氨酰胺合成酶
D.
核酸酶
【判断题】An individual with extensive knowledge of a product category will likely spend more time in an external search process than someone with a moderate level of product category knowledge.
A.
正确
B.
错误
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