The English poets ______, Samuel Taylor Coleridge, and Robert Southey, were known as "Lake Poets" because they lived in the English Lake District in Northwestern England at the beginning of the 19th century.
A. George Gordon Byron
B. John Keats
C. PercyB. Shelley
D. William Wordsworth
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下列说法错误的是______．
A. 若(X，Y)服从二维正态分布，则X-Y服从一维正态分布
B. 若(X，Y)都服从正态分布，则X-Y也服从正态分布
C. 若(X，Y，Z)服从多维正态分布，则X，Y，Z相互独立与它们两两不相关等价
D. 若X，Y相互独立且都服从于正态分布，则X+Y也服从正态分布
关于医德规范，下述提法中错误的是
A. 医德观范是医德原则的具体体现和补充
B. 医德规范是医德行为的具体标准
C. 《中国医学生誓言》是我国唯一的医德规范
D. 医德规范是协调各种医疗关系的行为准则
E. 医德观范是把医德理想变成医德实践的中间环节
The author is primarily concerned with describing______.
A. the Aleuts' loyalty to their language and American failure to understand it
B. Russian and United States' treatment of Alaskan inhabitants both before and after 1867
C. how the Czarist Russian occupation of Alaska created a written language for the Aleuts
D. United States government attempts to persuade the Aleuts to use English as a second language
ABS工程塑料管由热塑性丙烯腈丁二烯——苯乙烯三元共聚体粘料经注射、挤压成型加工制成，使用温度为( )℃，压力等级分为B、C、D三级。
A. -10～50
B. -20～50
C. -10～70
D. -20～70
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