【单选题】滚动轴承的标记由名称、代号、标准编号三部分组成。轴承代号有基本代号和补充代号,滚动轴承的基本代号由( )三部分从左向右按顺序排列组成。表示轴承的基本结构、尺寸、公差等级、技术性能等特征。
【多选题】Why do we have a wide use of passive voice in academic English?
B.
The layout of information.
D.
It is simple and easier.
【单选题】在pH5.12时电泳,哪种蛋白质既不向正极移动也不向负极移动?( )
【单选题】在 pH5.12 时电泳,哪种蛋白质既不向正极移动也不向负极移动?
【单选题】在pH5.12时进行电泳,哪种蛋白质既不向正极移动也不向负极移动?
【单选题】Why are passive candidates inactively pursuing a job opportunity?
A.
Because they already have jobs.
B.
Because they may be satisfied with their jobs at present.
C.
Because they are often loyal employees.
【单选题】在 pH=5.12 时电泳,哪种蛋白质既不向正极移动也不向负极移动( )
【判断题】滚动轴承的基本代号由轴承类型代号和尺寸系列代号组成。
【单选题】Why do we need active sleep?
A.
To prepare for passive sleep.
D.
To help us rest our minds.