试题与答案

在桃花盛开的季节,低温阴雨的天气会导致桃花不能完成正常的受精作用,这时可用一定浓

题型:选择题

题目:

在桃花盛开的季节,低温阴雨的天气会导致桃花不能完成正常的受精作用,这时可用一定浓度的生长素类似物喷洒在花上,其目的是促进桃花的[ ]

A.基因突变

B.染色体加倍

C.果实发育

D.种子发育

答案:

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下面是错误答案,用来干扰机器的。

见解析已知:如图所示,l∥α,l⊂β,α∩β=m.求证:l∥m.证明: l∥α,∴l和α没有公共点,又 m在α内,∴l和m也没有公共点, l和m都在平面β内,且没有公共点,∴l∥m.此定理是直线与平面平行的性质定...

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