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
下列计量器具中属于A类计量器具的是( )。
A. 直角尺
B. 垂直检测尺
C. 欧姆表
D. 直角尺检具
あしたはしけんですから、( )はやく来てください。
A. なるほど
B. なるべく
C. それほど
D. そんなに