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【单选题】
关于光纤制备工艺的说法正确的是?
A.
实心的预制棒的折射率的剖面和要得到的光纤区别非常大;
B.
制备对纤芯的材料、包层特别是靠外面的包层材料要求都非常高;
C.
OVD , MCVD 以及 PCVD 工艺不需要预制棒熔缩;
D.
纤芯可采用预制棒的工艺来制备,包层则可通过套棒的工艺实现。
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A.
30%
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27%
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A.
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B.
It’s here
C.
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D.
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A.
am
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A.
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B.
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C.
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E.
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A.
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B.
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【单选题】张爷爷,男性,75岁,体重60kg。不慎被开水烫伤,自觉剧痛,头面部、颈部及双上肢均为水疱。该病人的烧伤面积为
A.
30%
B.
21%
C.
27%
D.
32%
E.
35%
【单选题】- You seem to be familiar with this city. - I_______ here for three years. It's great to be back.
A.
have lived
B.
lived
C.
had lived
D.
live
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