单选题
无换向器电动机的速度调节主要通过控制（ ）实现。
转子位置检测器
零电流检测单元
整流侧触发角α
换流超前角γ0
单选题
无换向器电动机高速运行在第三象限电动状态时，对应的整流侧触发角和换流超前角分别是（ ）。
α>90°, γ0=120°
α<90°, γ0=120°
α>90°, γ0=180°
α<90°, γ0=180°
单选题
What does “maintain” mean in the sentence “we build and maintain relationships with different kinds of people”?
Keep up.
Give up.
Stand up.
单选题
Why is keeping salespeople “on the road” much more expensive than employing them to work in the office?
Because they have to explain things to us.
Because they have to listen to and take note of what we tell them.
Because they have to spend much of their time in traveling.
单选题
According to the passage, what is more effective in saving time?
Telephone meeting.
Face-to-face meeting.
Sales conference.
单选题
What companies often have a separate export sales force?
Export companies.
Import companies.
Overseas companies.
单选题
In sales conferences, the entire sales force can____________.
not receive information
travel to other countries
ask questions about new products
单选题
Which company takes the leading position?
Alibaba.
Baidu.
Tencent.
单选题
What is Youku's market share?
3.8%.
8.9%.
11.4%.
单选题
Which company's market share accounts for 11.8%?
Alibaba.
Baidu.
Tencent.