皮皮学，免费搜题
登录
搜题
【单选题】
( )是一种根据电量(如电压、电流)或非电量(如转速、时间、温度)的变化,接通或断开控制电路的电器。A.
刀开关
B.
接触器
C.
主令电器
D.
继电器
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】滚动轴承的核心元件是（），它使相对运动表面间的滑动摩擦变为滚动摩擦。
【单选题】What is the main idea of Para 5-7(last three paragraphs)?
A.
DNA's future tendencies.
B.
DNA's controversy.
C.
DNA's potentials.
D.
DNA's social issues.
【简答题】滚动轴承的核心元件是 。
【单选题】(Para 7)It's been six years since he _____ from college.
A.
graduating
B.
graduated
C.
graduates
D.
graduate
【简答题】滚动轴承的核心元件是滚动体，它使相对运动表面间的滑动摩擦变为（）。
【单选题】According to 'the Queen's Golden Jubilee' (Para.3), how long has been the reign of the Queen?
A.
It has to be 25 years under the reign of the Queen.
B.
45 years should be the minimum for the Queen's Golden Jubilee.
C.
At her age of 50, people usually celebrate the Queen's Golden Jubilee.
D.
The Queen's Golden Jubilee would be celebrated at her 50 year's reign.
相关题目：
参考解析：
知识点：
题目纠错 0
发布
