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【简答题】
数量性状间遗传相关的利用:性状之间有较高的遗传相关——通过测定和选择易于测定的性状,如日增重,来间接选择测定工作繁琐的性状,如( );选种时选择其中的一个性状如( ),可以间接地改进另外一个性状如乳蛋白量。
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举一反三
【单选题】'People from the ancient world sailed around Africa. They even reached America.' In your opinion, how would the writer of the passage feel about these ideas?
A.
He has used this as an important fact to praise ancient civilization.
B.
He does not believe them.
C.
In his opinion, ancient explorers did not have the skills necessary for long journeys.
D.
In his opinion, they are possible.
【判断题】Early explorers sailed aimless on the sea and discovered new lands by luck.
A.
正确
B.
错误
【单选题】3-17、已知ch是字符型变量,下面不正确的赋值语句是__________。
A.
ch='a+b';
B.
ch='\0';
C.
ch='7'+'9';
D.
ch=5+9;
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