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【简答题】
假设你是一位投资基金的管理者,并已经获得了以下估计: E(XM)=0.16 σ^2 (XM)=0.20 r=0.08 假设对证券j有E(Xj)=0.12,cov(Xj, XM)=0.01,试给出对该证券的投资建议。
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【单选题】Protoplasts are plant cells that have had their cell walls removed. What happens if plant protoplasts are placed in distilled water?
A.
They get larger and become turgid.
B.
They get larger and burst
C.
They get smaller and become plasmolysed
D.
They get smaller and shrivel up
【简答题】protoplasts
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【简答题】下面是一段视频播放程序片断,请根据注释在空白划线片填写代码。 private void initVideoPath() { File file = new File(Environment.getExternalStorageDirectory(), "movie.3gp"); // 为视频播放对象 videoView 设置视频文件 file ( 1 ) _____________________...
【单选题】When you _________ an author, you restate or summarize his or her ideas in your own words.
A.
quote
B.
introduce
C.
paraphrase
D.
annotate
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