问题
选择题
与航空航天技术相比较，地震预测仍是世界难题，正所谓“上天容易入地难”。 “入地难”就难在
A．人们认识和掌握地震发生规律仍然缺乏一定的主客观条件
B．地壳深部的不可入性使人们永远无法了解地震发生的规律
C．地壳发生的小概率性使人们认识无法得到实践的检验
D．地壳运动具有复杂性，其运动并没有规律可言
答案
答案：C
搜题请搜索小程序“爱下问搜题”
与航空航天技术相比较，地震预测仍是世界难题，正所谓“上天容易入地难”。 “入地难”就难在
A．人们认识和掌握地震发生规律仍然缺乏一定的主客观条件
B．地壳深部的不可入性使人们永远无法了解地震发生的规律
C．地壳发生的小概率性使人们认识无法得到实践的检验
D．地壳运动具有复杂性，其运动并没有规律可言
答案：C
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