试题与答案

下列说法中,不符合达尔文自然选择学说的是( ) A.各种生物普遍具有很强的繁殖能

题型:选择题

题目:

下列说法中,不符合达尔文自然选择学说的是( )

A.各种生物普遍具有很强的繁殖能力

B.环境变化造成生物出现定向的变异

C.生物为获取足够的食物和空间进行生存斗争

D.自然选择的结果是适者生存,不适者被淘汰

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B解析:本题考点为后张有粘结预应力孔道灌浆知识,且实践性较强,难度较大。四个选项中只有"压浆完成48h以后,结构混凝土的温度可以低于5℃"说法有误。正确做法:压浆过程中及压浆后24h内,结构混凝土...

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