【简答题】霍尔效应中霍尔电势差的产生是由于运动电荷在磁场中受 (1) 作用的结果。
【单选题】What did the company president do the previous night?
A.
He considered his feelings and thought about his problems.
B.
He thought about whether he should say something.
C.
He planned how he was going to tell his workers.
D.
He wrote out the different habits of different peoples.
【单选题】China’s economic development has made ______ rapid progress in the past 10 years, and young people have made ______ great contribution to this progress.
【单选题】What did the company decide to do at the next step?
A.
It would tighten up its maintenance program.
B.
It premised to suspend flights temporarily.
C.
It promised to strengthen its security conditions.
D.
It decided to resort to the law.
【单选题】What did the company lack before the man's scheme was implemented?
【单选题】What did the company decide to do at the next step?
A.
It would tighten up its maintenance program.
B.
It promised to suspend flights temporarily.
C.
It promised to strengthen its security conditions.
D.
It decided to resort to the law.
【单选题】What did the company do to meet competitive costs?
A.
Mini-roller covers would be developed in a variety of professional-quality fabrics that would be more affordable than traditional small-diameter covers.
B.
Develop a system that turned more freely.
C.
Use low-quality materials.