Deep Brain Stimulation is most effective for
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We rarely smell things in dreams.
A petition has to be mailed to the Prime Minister's house in London.
The new product has been a commercial Success in the USA.
某企业拟进行一项存在一定风险的完整工业项目投资,有甲、乙两个方案可供选择:已知甲方案的期望值为1 200万元,标准差为300万元;乙方案分配的期望值为1 500万元,标准差为400万元。下列结论中正确的是()。