下列波长中,()可以用作泵浦光。 A.850nm B.1310nm C.980nm 发布时间:2017-08-08 08:49 │ 来源:www.tikuol.com 题型:多项选择题 问题: 下列波长中,()可以用作泵浦光。A.850nmB.1310nmC.980nmD.1480nm
题型:多项选择题 -- Perhaps Tom's not in.-- ________. Look, the light's on.A.Yes, he can be at homeB.No, he mustn't go outC.Yes, he must be at homeD.No, he needn't go out 查看答案