单项选择题

按机床面板下方绿色电源键，开动机床。
A、正确
B、错误

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单项选择题建设项目经济评价分为（　　）。
Ⅰ．财务评价；Ⅱ．国民经济评价；Ⅲ．市场评价；Ⅳ．潜力评价。

A.Ⅰ、Ⅱ
B.Ⅱ、Ⅲ
C.Ⅲ、Ⅳ
D.Ⅰ、Ⅳ

男性，44岁,一周前上感伴晐嗽，三小时前突然咯鲜血，量达300ml，无胸痛。既往有痰中带鲜血史。査体：体温3...

单项选择题男性，44岁,一周前上感伴晐嗽，三小时前突然咯鲜血，量达300ml，无胸痛。既往有痰中带鲜血史。査体：体温37.3。C，血压正常,双肺叩清,右下肺可闻中小水泡音,心尖部可闻III/6级收缩期吹风样杂音。最可能的诊断

A.肺结核伴空洞
B.支气管扩张
C.肺梗塞
D.肺炎球菌肺炎
E.风湿性心脏瓣膜病

Which of the following statements about nuclear genome ...

单项选择题Which of the following statements about nuclear genome organization is CORRECT?

A．Centromeres are sequences located at the ends of each chromosome.
B．Nucleolar organizer regions are portions of chromosomes where ribosomal RNA genes are clustered and transcribed.
C．Telomeres are where sister chromatids adhere to each other and where spindle fibers attach during cell division.
D．Chromosome organization is random in the interphase nucleus.

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