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【简答题】
What is retroviral vector ,and how to use retroviral vector for g ene therapy ?
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【单选题】Civil engineering materials can be dived into brittle materials and toughness materials, and the characteristic of brittle materials is ( ).
A.
that they fails without obvious deformation
B.
that their compressive strength is two times of their bending strength
C.
that they can absorb high energy before cracking
D.
that they fails without deformation
【多选题】Brittle materials have which of the following characteristics( )
A.
they undergo a lot of permanent deformation before fracturing
B.
they tend to have a very ordered atomic structure
C.
they respond poorly to tensile forces
D.
A and B
【简答题】Draw the tensile tress-strain diagrams for brittle and ductile materials, respectively. 1) Label plastic region & elastic region; 2) Discuss how to distinguish ductile materials from brittle materials...
【单选题】下列关于丢失身份证,导游人员首先应
A.
先到公安局报失,再由旅行社开具证明,安检人员核准放行
B.
先由当地旅游核实后开具证明,再到公安局报失,经核实后开具身份证明
C.
先报名机场安检部门并报失,再到公安局补发临时身份证
D.
先由当地旅行社核实后开具证明,再到丢失地的公安局办理新的身份证
【判断题】Usually in brittle materials, the larger the flaw, the less the ability to withstand any degree ofload.
A.
正确
B.
错误
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