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【单选题】
下列组合肉猪杂交优势最好的是（ ）
A.
杜洛克猪♂×长♂×凉山猪♀
B.
杜洛克猪♂×长♂×荣昌猪♀
C.
杜洛克猪♂×长♂×大约克夏猪♀
D.
长♂×大约克夏猪♂×荣昌猪♀
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举一反三
【单选题】下列组合正确的是（）
A.
滴虫阴道炎豆渣样阴道分泌物
B.
外阴阴道假丝酵母菌病黄白色泡沫阴道分泌物
C.
细菌性阴道病血性阴道分泌物
D.
萎缩性阴道炎匀质稀薄阴道分泌物
E.
宫颈癌晚期米汤样阴道分泌物
【单选题】In the 1920s demand for American farm products fell, as European countries began to recover from World War I and instituted austerity (紧缩) programs to reduce their imports. The result was a sharp drop...
A.
might cause greater scarcity of farm products
B.
didn't give the Secretary of Agriculture enough power
C.
would benefit neither the government nor the farmers
D.
benefited one group of citizens at the expense of others
【单选题】当F+×F-杂交是下列说法对的是( )
A.
F因子几乎总不转移到F+细胞中
B.
F- 菌株几乎总成为F+
C.
基因重组的发生频率较高
D.
F因子经常插入到F-细胞染色体上
相关题目：
【单选题】下列组合正确的是（）
A.
滴虫阴道炎豆渣样阴道分泌物
B.
外阴阴道假丝酵母菌病黄白色泡沫阴道分泌物
C.
细菌性阴道病血性阴道分泌物
D.
萎缩性阴道炎匀质稀薄阴道分泌物
E.
宫颈癌晚期米汤样阴道分泌物
【单选题】In the 1920s demand for American farm products fell, as European countries began to recover from World War I and instituted austerity (紧缩) programs to reduce their imports. The result was a sharp drop...
A.
might cause greater scarcity of farm products
B.
didn't give the Secretary of Agriculture enough power
C.
would benefit neither the government nor the farmers
D.
benefited one group of citizens at the expense of others
【单选题】当F+×F-杂交是下列说法对的是( )
A.
F因子几乎总不转移到F+细胞中
B.
F- 菌株几乎总成为F+
C.
基因重组的发生频率较高
D.
F因子经常插入到F-细胞染色体上
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