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【判断题】
用两个平行的剖切面剖切视图的时候应该在剖视图上转折处画线。A.
正确
B.
错误
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【判断题】大肠杆菌色氨酸操纵子转录是通过操纵区和阻遏蛋白控制的,当色氨酸供应不足时,阻遏物失了所结合的色氨酸,从操纵区上解离下来,trp操纵子的转录就此开始。这个系统是典型的负控诱导系统。
A.
正确
B.
错误
【单选题】Section A Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A , B, C, an...
A.
on
B.
in
C.
with
D.
for
【判断题】大肠杆菌色氨酸操纵子转录是通过操纵区和阻遏蛋白控制的,当色氨酸供应不足时,阻遏物失了所结合的色氨酸,从操纵区上解离下来,trp操纵子的转录就此开始。这个系统是典型的负控诱导系统。
A.
正确
B.
错误
【单选题】Section A Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A , B, C, an...
A.
to say
B.
to have said
C.
say
D.
said
【单选题】Section A Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A , B, C, an...
A.
At large
B.
By far
C.
In common
D.
In general
【判断题】大肠杆菌色氨酸操纵子转录是通过操纵区和阻遏蛋白控制的。当色氨酸供应不足时，阻遏物失去了所结合的色氨酸，从操纵区上解离下来，trp操纵子的转录就此开始。这个系统是典型的负控诱导系统。
A.
正确
B.
错误
【简答题】Section ADirections: In this section, there is a passage with ten blanks. You are required to select one word for each blank from a list of choices given in a word bank following the passage. Read the...
【单选题】Section A Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A , B, C, an...
A.
to
B.
of
C.
with
D.
on
【单选题】Section A Directions: In this section, there are 10 incomplete sentences. You are required to complete each one by deciding on the most appropriate word or words from the 4 choices marked A , B, C, an...
A.
hears
B.
sounds
C.
looks
D.
feels
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