[单选题]日常电气设备的维护和保养应由设备管理人员负责。
A.对
B.错

Most people can remember a time in their lives when they learned something almost by accident, that is, without consciously (有意识地) trying to learn it. Often this kind of learning happens when we are trying to learn something else. For example, many people learn a number of English words not by memorizing them or studying them directly, but by doing something they enjoy, like listening to popular songs that contain them. Similarly, some people learn words in Chinese or Japanese not by studying those languages directly, but by studying martial arts, such as kung fu or aikido, in which Chinese or Japanese terms are used. Foreign students in the United States often learn the system of measurement simply by having to shop and cook for themselves. Those activities require them to learn words like pound, gallon, inch and yard.
Many educators believe that such a kind of learning, generally called content-based learning, is the best way to learn the rules of a system. Supp
A. are necessary for students to study systems
B. require people to know how to measure
C. tell one what is needed to learn to live there
D. help one learn measure words used in that country