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问题 单项选择题

我国的能源规划实行与( )挂钩的资源税费计征办法。

A．单采率

B．回采制

C．多采率

D．回采率

答案

参考答案：D

解析： 我国的能源规划实行与回采率挂钩的资源税费计征办法。

单项选择题 A1/A2型题

血液中CO的主要运输形式是（）

A.HCO-3

B.H2CO3

C.氨基甲酸血红蛋白

D.物理溶解CO2

E.CO2-3
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问答题

In an inversion heterozygote. one of its chromosomes shows the following linkage relationship:


In the homologous chromosome, there exists an inversion in the region


(1)What type of inversion is it
(2)Please draw a synaptic scheme(联会图)of these two chromosomes.
(3)If in the inverted chromosome region there is a lethal gene D at d locus, and in the normal(i.e., without inversion)chromosome there is another lethal gene F at f locus. How much of F1 individuals will be double(both at d and f loci) heterozygote when the inversion heterozygote self-crosses Why
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