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【单选题】
Hfr菌株与F-菌株接合后,发生基因重组的频率要比单纯用F+与F-接合后的频率高出数百倍,这是因为在Hfr菌株细胞中,其F( )
A.
处于游离态
B.
已整合在和染色体组特定位点上
C.
已被裂解
D.
是部分双倍体
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【判断题】人体触电的方式包括单相触电、三相触电、跨步电压、雷击触电等
A.
正确
B.
错误
【单选题】离心泵效率随流量的变化情况是( )。
A.
Q增大,可增大
B.
Q增大,可先增大后减小
C.
Q增大,可减小
D.
Q增大,可先减小后增大
【单选题】is the max. horizontal distance from bow to stern
A.
Length overall
B.
Length BP
C.
Breadth
D.
Depth
【简答题】人体触电的方式一般有 、 、 三种方式。A.
【判断题】Richard asked Ellen to take care of Max.
A.
正确
B.
错误
【单选题】Annual DinnerStaff: freeGuests: £15 ( max. 1 guest per employee)Limited place available -- BOOK NOW!Staff who wish to attend the dinner ______ .
A.
are allowed to invite only one person each.
B.
must book today if they want to invite a friend.
C.
have to pay £15 each for themselves and their partner.
【判断题】It is through xiaoli who I know xiaowang.
A.
正确
B.
错误
【单选题】Which of the following branches belongs to morphology?
A.
Inflectional Morphology.
B.
Allomorphemic Morphology.
C.
Phonemic Morphology.
D.
Lexeme.
【简答题】人体触电的方式一般有 、 、 三种方式。
【单选题】Come and _____ the great clothes for yourself. [     ]
A.
  have look
B.
  have a look
C.
  have look at
D.
  have a look at
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