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问题 单项选择题

著名俄罗斯诗人普希金1836年创办的文学和社会政治杂志后来成了革命民主主义的著名期刊，它是（）

A．《祖国纪事》

B．《钟声》

C．《同时代人》

D．《北极星》

答案

参考答案：C

单项选择题

具有示病意义的病变是（）（629-10）

A、脾脏边缘梗死

B、肺脏出血

C、心肌出血

D、肾脏出血

E、淋巴结肿大
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单项选择题

When is the t- distribution the appropriate distribution to use The t -distribution is the appropriate distribution to use when constructing confidence intervals based on:（）

A. small samples from populations with known variance that are at least approximately normal.

B. large samples from populations with known variance that are nonnormal.

C. small samples from populations with unknown variance that are at least approximately normal.
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