光纤的__和__是光信号受到损伤的主要原因。
更新时间:2024-04-28 00:58:30衰减、非线性特性
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Iaskedhimto________meafewminutessothatwecouldgooveralltheproblems.
翻译：Itisnousetellinggrown-upchildrennottomakemistakes,bothbecausetheywillnotbelieveyou,andbecausemistakesareanessentialpartofeducation.
_______isafactthatEnglishisbeingacceptedasaninternationallanguage.
Johnsonwas________unknownbeforerunningforthepresidency.
TheIndo-EuropeanlanguagefamilyismadeupofthelanguagesofthefollowingEXCEPT______.
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