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【单选题】
生命活动的物质基础是构成细胞的化合物，下列有关化合物功能的叙述，正确的是（）A.
生命活动由蛋白质调节
B.
干种子因缺乏自由水不能萌发
C.
多糖是植物细胞的能源物质
D.
生物的遗传物质是DNA
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【简答题】说明限制性内切核酸酶的命名原则要点。
【多选题】TTL门电路如图所示,其中可以实现Y=0的逻辑电路有: , 已知关门电阻Roff=0.91kΩ,开门电阻Ron=1.93kΩ。
A.
(a)
B.
(b)
C.
(c)
D.
(d)
【多选题】TTL门电路如图所示,其中可以实现Y=A'的逻辑电路有: ,已知关门电阻Roff=0.91kΩ,开门电阻Ron=1.93kΩ。
A.
(a)
B.
(b)
C.
(c)
D.
(d)
【单选题】Perception is
A.
the process by which individuals connect to their environment.
B.
strongly influenced by the receiver's current state of mind, role and understanding or comprehension of earlier communications.
C.
a factor that can affect how meanings are ascribed.
D.
a complex physical and psychological process.
E.
All of the above describe perception.
【单选题】Perception is
A.
the process by which individuals connect to their environment.
B.
strongly influenced by the receiver's current state of mind, role and understanding or comprehension
C.
a factor that can affect how meanings are ascribed.
D.
a complex physical and psychological process.
E.
All of the above describe perception.
【多选题】TTL 门电路如图所示,其中可以实现 Y=A’ 的逻辑电路有: , 已知关门电阻 Roff=0.91k Ω,开门电阻 Ron=1.93k Ω。
A.
b
B.
d
C.
a
D.
c
【简答题】说明限制性内切核酸酶的命名原则要点。
【简答题】说明限制性内切核酸酶的命名原则要点。
【单选题】We now think of subliminal perception as:
A.
harmful to children
B.
perception of stimuli that are above the psychological limen but are not conscious
C.
not possible
D.
the unconscious perception of weak or disguised stimuli
E.
perception of stimuli that are below the physical limen
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