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【简答题】
简述光纤波导色散与光纤折射率分布参数 g 的关系。
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举一反三
【单选题】When the teacher came in, Jack _____ with his classmates. [ ]
A.
talking
B.
was talking
C.
talked
D.
talks
【单选题】The students __________ loudly when the teacher came in. [ ]
A.
talked
B.
talking
C.
were talking
D.
to talk
【单选题】When the teacher came in, the students pretended _____ the text.
A.
to read
B.
reading
C.
to have read
D.
to be reading
【单选题】Mark's posture and attitude______ boredom when the teacher was giving his instructions.
A.
transmitted
B.
delivered
C.
endowed
D.
implied
【简答题】三极管按其内部结构分为__、__。
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