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【多选题】
基因工程载体与目的基因连接的方式有A.
平末端连接
B.
粘性末端连接
C.
剪刀连接
D.
平滑连接
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反馈参考答案：
举一反三
【简答题】Topic Card Describe a country or city where you want to live or work in the future You should say: Where the country or city is What you do to achieve your dreams Who you like to live or work with a...
【简答题】在车床上加工零件，要求该零件某表面粗糙度轮廓的最大高度的上限值为16μm，应采用的表面粗糙度轮廓代号是( )。
【单选题】We can learn from the text that a new law in Pennsylvanian
A.
will subject insurance companies to lawsuits.
B.
helps solve the problem of hospital staff errors.
C.
may leave doctors a little better protected.
D.
helps patients sue a doctor for damages.
【单选题】China's new food law provides for a food recall system________ producers have to stop production if their food isn't up to standards. [ ]
A.
where
B.
that
C.
when
D.
which
【单选题】《流浪地球》电影中描述到了木星。木星质量比地球大得多木星对地球的引力大小为F1,地球对木星的引力大小为F2,则F1与F2的大小关系为
A.
F1＜F2
B.
F1＞F2
C.
F1＝F2
D.
无法确定
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