[单选题]《铁路旅客运输规程》规定，在无人售票的乘降所上车的人员，可在列车内购票，（）。
A.不收手续费
B.按规定核收手续费
C.手续费减半
D.核收2元手续费

[多项选择]绝缘架空地线应视为带电体，如需在绝缘架空地线上作业，应（ ）。
A. 将其可靠接地
B. 采用等电位方式进行
C. 用绝缘工具或戴绝缘手套

[多选题]LBD40114进行二次回路的“变动"工作时，应采取的安全措施有( )。
A.按经审批后的图纸进行
B.无用的接线应隔离清楚，以防止误拆或产生寄生回路
C.必要时，填用“二次工作安全措施票”
D.必要时，申请停用有关的继电保护装置、安全自动装置和自动化监控系统

[单项选择]The effect of the baby boom on the schools helped to make possible a shift in thinking about the role of public education in the 1920’s. In the 1920’s, but especially in the Depression of the 1930’s, the United States experienced a (31) birth rate. Then with the prosperity (32) by the Second World War and the economic boom that followed, young people married and (33) households earlier and began to (34) larger families than had their (35) during the Depression. Birth rates rose to 102 per thousand in 1946, 106.2 in 1950, and 118 in 1955. (36) economics was probably the most important (37) , it is not the only explanation for the baby boom. The increased value placed (38) the idea of the family also helps to (39) this rise in birth rates. The baby boomers began streaming (40) the first grade by the mid-1940s and became a (41) by 1950. The public school system suddenly found itself (42)
A. conference
B. symposium
C. seminar
D. discipline