题目内容
(请给出正确答案)
[主观题]
简述BIRD脉冲序列的作用。
答案
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第8题
A.which was the only mammal in New Zealand
B.which was introduced to New Zealand about 1000 years ago
C.which is an introduced flightless bird
D.which is a native flightless bird
第9题
有一幅度Φm=10-4m、持续时间tu=10-4s、重复周期Tu=5×10-3s的光脉冲序列,若光电检测电路的电压灵敏度SV=12V/lm,试求:
第10题
A.avoid
B.prevent
C.hinder
D.resist