Some—such as liquid oxygen—are so cold that they embrittle many constructional m

游客2025-01-23 22

问题 Some—such as liquid oxygen—are so cold that they embrittle many constructional materials and evaporate continuously if not refrigerated.

选项 A、weaken
B、strengthen
C、reduce
D、cause ... to become brittle

答案 D

解析

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Anoverwhelmingrichnessofvegetationmayhavecausedthelevelofoxygentori