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【单选题】
低压熔断器广泛应用于低压供配电系统和控制系统中，主要用于( )保护，有时也可用于过载保护。A.
短路
B.
速断
C.
D.
无
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反馈参考答案：
举一反三
【简答题】乙烷的优势构象为 ,丁烷四种典型构象分别是 、 、 、 ;优势构象是 。
【单选题】Why does the professor say this:
A.
To praise the area's beautiful winter scenery
B.
To persuade students to build their own homes
C.
To describe the most common one of limestone
D.
To explain why so many snakes live in the region
【单选题】吉首大学图书馆公众号能定期为读者推送图书馆相关信息及活动,同时读者关注公众号后绑定学号,在移动终端有网络服务时,可以方便地利用图书馆的资源和服务不受时间和空间的限制,包括:
A.
个人借阅信息查询
B.
续借
C.
预约、在线各种资源信息查阅、公开课、学术资源等
D.
以上均可实现
【多选题】黄河高原地区农村社会系统进入释放阶段的原因有:
A.
“大跃进”运动，国家把工业发展放在农业前面
B.
因农村劳动力缺乏导致土地被休耕弃耕
C.
前期农业发展积累潜能被不断消耗
D.
自然灾害频繁扰动
【单选题】Why does the professor say this:
A.
To emphasize the importance of commercials
B.
To correct something that he said earlier
C.
To identify the time limits for most commercials
D.
To relate new information to a previous example
【单选题】Why does the professor mention McDonald's?
A.
To compare the quality of its food withthe quality ofUSA Today's stories.
B.
To compare the design of its restaurantswith the look ofUSA Today's pages.
C.
To compare the great success ofMcDonald's with the success of USA Today.
D.
To compare the early years of McDonald'swith the early years of USA Today.
【单选题】Why does the man go to see his professor?
A.
He is worried about the professor's class.
B.
He wants to bring up the grade in her class.
C.
He would like some advice about his classes.
D.
He needs to get the woman's signature.
【多选题】黄河高原地区农村社会系统进入释放阶段的原因有:
A.
见对应时间视频
B.
“大跃进”运动，国家把工业发展放在农业前面
C.
因农村劳动力缺乏导致土地被休耕弃耕
D.
前期农业发展积累潜能被不断消耗
E.
自然灾害频繁扰动
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