题目内容
（请给出正确答案）
[主观题]
The economists think the profit opportunities are rare becauseA. the market is not efficie
The economists think the profit opportunities are rare because
A. the market is not efficient.
B. too many people go for it.
C. the prices are always fluctuating.
D. few people have the clear insights,
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，
，其中F1(jω)的最高频率分量为ω1，F2(jω)的最高频率分量为ω2，且ω2﹥ω1，现对组合信号
