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[问答题] 光纤是由什么材料组成的,有何特点?

东风桥变速箱和1000系列桥机型变速箱内85W/90齿轮油分别应加注多少? She is running a fever, but now it is under control.() ["She is running fast.","I will go and see her after work.","Her mother does not run.","She is running away from home."] 一般来说,对于损失类贷款,计提比例为() ["2%","25%","50%","100%"] 调度班组在进行委托操作前,相关方值班调度员应明确以下内容() ["委托操作范围","操作对象目标状态","有关注意事项","委托方值班人员情况"] She is not only my classmate()also my good friend. ["or","but","and","too"] 光纤是由什么材料组成的,有何特点?
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