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【单选题】
（）菌株与F-菌株接合后发生基因重组的频率最高。A.
Hfr
B.
F-
C.
F+
D.
F´
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皮皮学刷刷变学霸
举一反三
【单选题】On November 19, 1863, Abraham Lincoln went to Gettysburg in Pennsylvania to speak at the National Soldiers Cemetery. The Civil War was still going on. There was much criticism of President Lincoln at ...
A.
very critical
B.
unpopular
C.
very popular
D.
very courteous
【单选题】On November 19, 1863, Abraham Lincoln went to Gettysburg in Pennsylvania to speak at the National Soldiers Cemetery. The Civil War was still going on. There was much criticism of President Lincoln at ...
A.
very critical
B.
unpopular
C.
very popular
D.
very courteous
【单选题】On November 19, 1863, Abraham Lincoln went to Gettysburg in Pennsylvania to speak at the National Soldiers Cemetery. The Civil War was still going on. There was much criticism of president Lincoln at ...
A.
very critical
B.
unpopular
C.
very popular
D.
very courteous
【简答题】工程实际中，常将工程变更分为（ ）。
【单选题】The United Nations was ______ forty years ago and held a special conference in November 1985 to celebrate.
A.
established
B.
set
C.
completed
D.
settled
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