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【单选题】
有关突变的概念,下列哪一条叙述最正确A.
起源于基因的可遗传的变异
B.
起源于染色体的可遗传的变异
C.
起源于基因及染色体的可遗传的变异
D.
起源于基因的不可遗传的变异
E.
起源于染色体的不可遗传的变异
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举一反三
【简答题】集装箱货流的四种组织形式是:( )、( )、( )、( )。
【单选题】Laura _____ in this school since she came to China. [ ]
A.
is studying
B.
was studying
C.
will study
D.
has studied
【单选题】Which statement is TRUE concerning insulating flanges ________．
A.
They should be inspected and tested periodically to ensure that the insulation is clean and in good condition
B.
Switching off a cathodic protection system may be substituted for using an insulating flange
C.
The measured resistance value after installation should be less than 1，000 ohms
D.
After the insulating flange is installed，hot work may be performed on deck
【简答题】请简述DRNC820业务处理子系统的数据处理单元的实现单板，功能模块组成及作用
【单选题】Speaker A:Which school are you studying in? Speaker B:____________________________.
A.
I am studying in Fuzhou Vocational School
B.
I am from China
C.
I am very happy
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