【单选题】对于齿面硬度≤350 HBS的齿轮传动,若大、小齿轮均采用45钢,一般采取的热处理方式为
【单选题】—_____do you learn English so well? — _____ asking the teacher for help.
【多选题】直流电机不能启动或达不到启动转速的原因()
【单选题】下列关于旅游的叙述中,正确的是
B.
经商旅行实质上是具有现代旅游意义和本质特征的古代旅游活动
C.
农业的产生是人类旅行观念产生的社会基础和条件
D.
旅游的特点包括社会性、文化性、经济性和消费性
【单选题】If you ask how____ away a place is, you are asking how great a distance away it is.A.wideB.farC.
A.
40. If you ask how____ away a place is, you are asking how great a distance away it is. A.wide
【单选题】She is such a ________ person, always asking how I'm feeling.
【单选题】关于直流电机的组成,下列说法错误的是( )
D.
直流电机的转子由电枢铁芯、电枢绕组、换向器和转轴等组成
【单选题】---__________ do you study for a test? ---By asking the teacher for help.
【单选题】How will the woman probably solve the problem?
A.
By going to Miami on business
B.
By asking another worker to fill in for her
D.
By doing her work at home
【单选题】对于齿面硬度≤350HBS的齿轮传动,当采用同样钢材制造时,一般为 ( )。