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【简答题】
在一个遗传实验中,种植了 P1、P2、F1、F2共四个群体,调查从播种 至抽穗期的天数,获如下结果: 群体 P1 P2 F1 F2 均数 110 140 130 125 方差 12 14 13 50 试计算中亲杂种优势和抽穗期的广义遗传力。
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举一反三
【单选题】I'm not sure of the exact number of the audience , but ________ speaking , I would say there are 1,500 or so.
A.
honestly
B.
roughly
C.
properly
D.
strictly
【单选题】I'm not sure about the meaning of the word. You'd better _____ in a dictionary .
A.
look up it
B.
look it up
C.
look it for
D.
look for it
【单选题】I'm not sure about the meaning of the word. You'd better look it up in a . [ ]
A.
letter
B.
dictionary
C.
postcard
D.
notice
【单选题】I'm not sure of the exact number, but the ________ cost of this type of computer ranges from around $800 to $1000.
A.
present
B.
bare
C.
direct
D.
approximate
【单选题】加快资本周转，可以增加年剩余价值量和提高年剩余价值率，根本的是因为
A.
预付资本的数量增加了
B.
剩余价值率提高了
C.
流通对生产的作用加强了
D.
实际发挥作用的可变资本增加了
【简答题】I'm not sure of the exact number, but the __________ cost of this type of computer ranges from around $800 to $1000.(approximately)
【简答题】请按顺序按提示填写非重读的单词。 I'm not sure of the number.(3个非重读单词)
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